/wawr/, n., v., warred, warring, adj.
1. a conflict carried on by force of arms, as between nations or between parties within a nation; warfare, as by land, sea, or air.
2. a state or period of armed hostility or active military operations: The two nations were at war with each other.
3. a contest carried on by force of arms, as in a series of battles or campaigns: the War of 1812.
4. active hostility or contention; conflict; contest: a war of words.
5. aggressive business conflict, as through severe price cutting in the same industry or any other means of undermining competitors: a fare war among airlines; a trade war between nations.
6. a struggle: a war for men's minds; a war against poverty.
7. armed fighting, as a science, profession, activity, or art; methods or principles of waging armed conflict: War is the soldier's business.
8. Cards.
a. a game for two or more persons, played with a 52-card pack evenly divided between the players, in which each player turns up one card at a time with the higher card taking the lower, and in which, when both turned up cards match, each player lays one card face down and turns up another, the player with the higher card of the second turn taking all the cards laid down.
b. an occasion in this game when both turned up cards match.
9. Archaic. a battle.
10. to make or carry on war; fight: to war with a neighboring nation.
11. to carry on active hostility or contention: Throughout her life she warred with sin and corruption.
12. to be in conflict or in a state of strong opposition: The temptation warred with his conscience.
13. of, belonging to, used in, or due to war: war preparations; war hysteria.
[bef. 1150; (n.) ME, late OE werre < ONF < Gmc; c. OHG werra strife; (v.) ME, late OE werrien (transit.) to make war upon, deriv. of the n.; cf. OF guerrer, ONF werreier; akin to WAR2]
/wahr/, adj., adv. Scot. and North Eng.
[1150-1200; ME werre < ON verri WORSE]

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State of conflict, generally armed, between two or more entities.

It is characterized by intentional violence on the part of large bodies of individuals organized and trained for that purpose. On the national level, some wars are fought internally between rival political factions (civil war); others are fought against an external enemy. Wars have been fought in the name of religion, in self-defense, to acquire territory or resources, and to further the political aims of the aggressor state's leadership.
(as used in expressions)
Algerian War of Independence
United States War of Independence
Austrian Succession War of the
Bavarian Succession War of the
Devolution War of
Malvinas War
Franco Prussian War
Franco German War
man o' war bird
Grand Alliance War of the
Greek Independence War of
Hundred Years' War
Iran Iraq War
Italo Turkish War
Jenkins' Ear War of
King George's War
King Philip's War
King William's War
Lord Dunmore's War
Man o' War
Mexican American War
Northern War First
Northern War Second
Great Northern War
Onin War
Pacific War of the
Peasants' War
Persian Gulf War First
Persian Gulf War Second
Philippine American War
Polish Succession War of the
Portuguese man of war
Queen Anne's War
Russo Finnish War
Winter War
Russo Japanese War
Seven Weeks' War
Austro Prussian War
Seven Years' War
Sino French War
Sino Japanese War
Six Day War
Arab Israeli War of 1967
Marsic War
Italic War
Spanish Succession War of the
Spanish American War
Thirty Years' War
Three Henrys War of the
Triple Alliance War of the
Paraguayan War
Anglo Burmese Wars
Anglo Dutch Wars
Dutch Wars
Arab Israeli wars
Greco Turkish Wars
Greco Persian Wars
Carthaginian Wars
Religion Wars of
Roses Wars of the
Russo Turkish Wars
Vendée Wars of the

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      in the popular sense, a conflict among political groups involving hostilities of considerable duration and magnitude. In the usage of social science certain qualifications are added. Sociologists (sociology) usually apply the term to such conflicts only if they are initiated and conducted in accordance with socially recognized forms. They treat war as an institution recognized in custom or in law. Military writers usually confine the term to hostilities in which the contending groups are sufficiently equal in power to render the outcome uncertain for a time. Armed conflicts of powerful states with primitive peoples are usually called pacifications, military expeditions, or explorations; with small states, they are called interventions or reprisals; and with internal groups, rebellions or insurrections. Such incidents, if the resistance is sufficiently strong or protracted, may achieve a magnitude that entitles them to the name “war.”

      War is treated in several other articles. For the relation between diplomacy and war, see international relations, 20th-century (international relations). For the weapons of war, see military technology. For a history of World Wars I and II, see World War I and World War II. Other wars are covered in the history sections of articles on the relevant countries or regions—e.g., for the American Civil War, see United States, history of: Civil War (United States); for the Punic Wars, see ancient Rome: The middle republic (ancient Rome).

      In all ages war has been an important topic of analysis. In the latter part of the 20th century, in the aftermath of two world wars and in the shadow of nuclear, biological, and chemical holocaust, more has been written on the subject than ever before. Endeavours to understand the nature of war, to formulate some theory of its causes, conduct, and prevention, are of great importance, for theory shapes human expectations and determines human behaviour. The various schools of theorists are generally aware of the profound influence they can exercise upon life, and their writings usually include a strong normative element, for, when accepted by politicians, their ideas can assume the characteristics of self-fulfilling prophecies.

      The analysis of war may be divided into several categories. Philosophical, political, economic, technological, legal, sociological, and psychological approaches are frequently distinguished. These distinctions indicate the varying focuses of interest and the different analytical categories employed by the theoretician, but most of the actual theories are mixed because war is an extremely complex social phenomenon that cannot be explained by any single factor or through any single approach.

Evolution of theories of war
      Reflecting changes in the international system, theories of war have passed through several phases in the course of the past three centuries. After the ending of the wars of religion, about the middle of the 17th century, wars were fought for the interests of individual sovereigns and were limited both in their objectives and in their scope. The art of maneuver became decisive, and analysis of war was couched accordingly in terms of strategies. The situation changed fundamentally with the outbreak of the French Revolution, which increased the size of forces from small professional to large conscript armies and broadened the objectives of war to the ideals of the revolution, ideals that appealed to the masses who were subject to conscription. In the relative order of post-Napoleonic Europe the mainstream of theory returned to the idea of war as a rational, limited instrument of national policy. This approach was best articulated by the Prussian military theorist Carl von Clausewitz (Clausewitz, Carl von) in his famous classic On War (1832–37).

       World War I, which was “total” in character because it resulted in the mobilization of entire populations and economies for a prolonged period of time, did not fit into the Clausewitzian pattern of limited conflict, and it led to a renewal of other theories. These no longer regarded war as a rational instrument of state policy. The theorists held that war, in its modern, total form, if still conceived as a national state instrument, should be undertaken only if the most vital interests of the state, touching upon its very survival, are concerned. Otherwise, warfare serves broad ideologies and not the more narrowly defined interests of a sovereign or a nation. Like the religious wars of the 17th century, war becomes part of “grand designs,” such as the rising of the proletariat in communist eschatology or the Nazi doctrine of a master race.

      Some theoreticians have gone even further, denying war any rational character whatsoever. To them war is a calamity and a social disaster, whether it is afflicted by one nation upon another or conceived of as afflicting humanity as a whole. The idea is not new—in the aftermath of the Napoleonic Wars it was articulated, for example, by Tolstoy (Tolstoy, Leo) in the concluding chapter of War and Peace (1865–69). In the second half of the 20th century it gained new currency in peace research, a contemporary form of theorizing that combines analysis of the origins of warfare with a strong normative element aiming at its prevention. Peace research concentrates on two areas: the analysis of the international system and the empirical study of the phenomenon of war.

       World War II and the subsequent evolution of weapons of mass destruction (military technology) made the task of understanding the nature of war even more urgent. On the one hand, war has become an intractable social phenomenon, the elimination of which seems to be an essential precondition for the survival of mankind. On the other hand, the use of war as an instrument of policy is calculated in an unprecedented manner by the nuclear superpowers, the United States and the Soviet Union. War also remains a stark but rational instrumentality in certain more limited conflicts, such as those between Israel and the Arab nations. Thinking about war is, consequently, becoming increasingly more differentiated because it has to answer questions related to very different types of conflict.

      Clausewitz cogently defines war as a rational instrument of foreign policy: “an act of violence intended to compel our opponent to fulfill our will.” Modern definitions of war, such as “armed conflict between political units,” generally disregard the narrow, legalistic definitions characteristic of the 19th century, which limited the concept to formally declared war between states. Such a definition includes civil wars but at the same time excludes such phenomena as insurrections, banditry, or piracy. Finally, war is generally understood to embrace only armed conflicts on a fairly large scale, usually excluding conflicts in which fewer than 50,000 combatants are involved.

The causes of war
      Contemporary theories of the causes of war divide roughly into two major schools. One attributes war to certain innate biological and psychological factors or drives, the other attributes it to certain social relations and institutions. Both schools include optimists and pessimists concerning the preventability of war.

Biological theories
      Theories centring upon man's innate drives are developed by ethologists, who draw analogies from animal behaviour, and also by psychologists and psychoanalysts.

      Ethologists start with the persuasive argument that study of animal (animal behaviour) warfare may contribute toward an understanding of war as employed by man. The behaviour of monkeys and apes in captivity and of young children, for example, shows basic similarities. In both cases it is possible to observe that aggressive behaviour usually arises from several drives: rivalry for possession, the intrusion of a stranger, or frustration of an activity. The major conflict situations leading to aggression among animals, especially those concerning access of males to females and control of a territory for feeding and breeding, are usually associated with patterns of dominance.

      The analogies of animal to human behaviour drawn by many ethologists, however, are severely questioned by their more restrained colleagues as well as by many social scientists. The term aggression, for example, is imprecisely and inconsistently used, often referring merely to the largely symbolic behaviour of animals involving such signals as grimaces.

      Observed animal behaviour can be regarded as a possible important source of inspiration for hypotheses, but these must then be checked through the study of actual human behaviour. As this has not yet been adequately done, the hypotheses advanced have little foundation and are merely interesting ideas to be investigated. Further, human behaviour is not fixed to the extent that animal behaviour is, partly because man rapidly evolves different patterns of behaviour in response to environmental factors, such as geography, climate, and contact with other social groups. The variety of these behaviour patterns is such that they can be used on both sides of an argument concerning, for example, whether or not men have an innate tendency to be aggressive.

      Two particularly interesting subjects studied by ethologists are the effects of overcrowding on animals and animal behaviour regarding territory. The study of overcrowding is incomplete, and the findings that normal behaviour patterns tend to break down in such conditions and that aggressive behaviour often becomes prominent are subject to the qualification that animal and human reactions to overcrowding may be different. Ethologists have also advanced plausible hypotheses concerning biological means of population control through reduced fertility that occurs when animal populations increase beyond the capacity of their environment. Whether such biological control mechanisms operate in human society, however, requires further investigation.

      Findings concerning the “territorial imperative (territorial behaviour)” in animals—that is, the demarcation and defense against intrusion of a fixed area for feeding and breeding—are even more subject to qualification when an analogy is drawn from them to human behaviour. The analogy between an animal territory and a territorial state is obviously extremely tenuous. In nature the territories of members of a species differ in extent but usually seem to be provided with adequate resources, and use of force in their defense is rarely necessary, as the customary menacing signals generally lead to the withdrawal of potential rivals. This scarcely compares with the sometimes catastrophic defense of the territory of a national state.

      One school of theorists has postulated that the major causes of war can be found in man's psychological nature. Such psychological approaches range from very general, often merely intuitive assertions regarding human nature, to complex analyses utilizing the concepts and techniques of modern psychology. The former category includes a wide range of ethical and philosophical teaching and insights, including the works of such figures as St. Augustine and the 17th-century Dutch philosopher Spinoza.

      Modern writers utilizing psychological approaches emphasize the significance of psychological maladjustments or complexes and of false, stereotyped images held by decision makers of other countries and their leaders. Some psychologists posit an innate aggressiveness in man. Others concentrate upon public opinion and its influence, particularly in times of tension; others stress the importance of decision makers and the need for their careful selection and training. Most believe that an improved social adjustment of individuals would decrease frustration, insecurity, and fear and would reduce the likelihood of war. All of them believe in the importance of research and education. Still, the limitations of such approaches derive from their very generality. Also, whether the psychological premises are optimistic or pessimistic about the nature of man, one cannot ignore the impact upon human behaviour of social and political institutions that give man the opportunities to exercise his good or evil propensities and to impose restraints upon him.

Social theories
      Whereas psychological explanations of war contain much that seems to be valid, they are insufficient because man behaves differently in different social contexts. Hence many thinkers have sought their explanations in these contexts, focusing either on the internal organization of states (state) or on the international system within which these operate.

      The most voluminous and influential theories attributing war to the nature of the state fall into two broad streams, which can be loosely called liberal and socialist.

Liberal analyses (liberalism)
      The early or classical liberals of the 18th and 19th centuries distinguished three basic elements in their analysis—individuals, society, and the state—and regarded the state as the outcome of the interaction of the former two. They assumed that society is self-regulating and that the socioeconomic system is able to run smoothly with little interference from the government. Economy, decentralization, and freedom from governmental control were the classical liberal's main concerns, as shown particularly clearly in the writings of John Stuart Mill. They accepted the necessity of maintaining defense but postulated the existence of a basic harmony of interests among states, which would minimize the incidence of wars. Economic cooperation based upon an international division of labour and upon free trade would be in the interests of everybody—commerce would be the great panacea, the rational substitute for war.

      In explanation of wars that did occur, however, liberals emphasized a variety of factors. First, they focused on autocratic governments, which were presumed to wage war against the wishes of peacefully inclined people. It thus became a major tenet of liberal political philosophy that war could be eliminated by introducing universal suffrage because the people would surely vote out of office any belligerently inclined government. From the early American pamphleteer Thomas Paine (Paine, Thomas) onward, a major school of liberals supported republicanism and stressed the peaceful impact of public opinion. Although they could not agree about actual policies, they stressed certain general ideas concerning relations between states, paralleling their laissez-faire ideas of the internal organization of the state with ideas of a minimum amount of international organization, use of force strictly limited to repelling aggression, the importance of public opinion and of democratically elected governments, and rational resolution of conflicts and disputes. Later in the course of the 19th century, however, and especially after World War I, liberals began to accept the conclusion that an unregulated international society did not automatically tend toward peace and advocated international organization as a corrective.

Socialist analyses (socialism)
      Whereas liberals concentrated on political structures, regarding them as of primary importance in determining the propensity of states to engage in war, socialists turned to the socioeconomic system of states as the primary factor. Early in the 20th century the two streams did, to some extent, converge, as evidenced by the fact that the English radical liberal John Hobson explained wars in terms later adopted by Lenin.

      Karl Marx (Marx, Karl) attributed war not to the behaviour of states but to the class structure of society. To him wars occurred not as an often voluntary instrument of state policy but as the result of a clash of social forces. To Marx the state was merely a political superstructure; the primary, determining factor lies in the capitalist mode of production, which leads to the development of two antagonistic classes: the bourgeoisie and the proletariat. The bourgeoisie controls governmental machinery in its own interests. In its international relations, the capitalist (capitalism) state engages in wars because it is driven by the dynamism of its system—the constantly growing need for raw materials, markets, and supplies of cheap labour. The only way to avoid war is to remove its basic cause, by replacing capitalism with socialism, thus abolishing both class struggle and states. The Marxist doctrine, however, gave no clear guidance about the interim period before the millennium is reached; and the international solidarity of the proletariat proved a myth when war broke out in 1914, facing the European Social Democratic parties with the problem of adopting an attitude to the outbreak of the war. The Second International (International, Second) of working-class parties had repeatedly passed resolutions urging the working classes to bring pressure upon their respective governments to prevent war, but, once war had broken out, each individual party chose to regard it as defensive for its own state and to participate in the war effort. This was explained by Lenin as being due to a split in the organization of the proletariat that could be overcome only through the activity of a rigidly organized revolutionary vanguard.

      Socialists in the West turned increasingly, although in varying degrees, to revisionist (revisionism) interpretations of Marxism and returned to their attempts to revise socioeconomic structures through evolutionary constitutional processes, seeing this as the only possible means of preventing wars. In the Soviet Union (Union of Soviet Socialist Republics) the socialist theory of war changed as the new communist (communism) regime responded to changes in circumstances. Soviet theoreticians have distinguished three major types of war: between capitalist states, between capitalist and socialist states, and colonial wars of liberation. The internecine wars among capitalist states are supposed to arise from capitalist competition and imperialist rivalries, such as those that led to the two world wars. They are desirable, for they weaken the capitalist camp. A war between capitalist and socialist states is one that clearly expresses the basic principle of class struggle and is, therefore, one for which the socialist states must prepare. Finally, wars of colonial liberation can be expected between subjugated people and their colonial masters.

      The weakness of the theory is that the two major expected types of war, the intracapitalist and the capitalist–socialist, have not materialized as frequently as Soviet theoreticians predicted. Further, the theory failed to analyze adequately the situation in the Soviet Union and in the socialist camp. Even in communist countries, nationalism seems to have proved more powerful than socialism: “national liberation” movements have appeared and have had to be forcibly subdued in the Soviet Union, despite its communist regime. Also, war between socialist states is not unthinkable, as the doctrine indicates: only the colossal preponderance of Soviet forces prevented a full-scale war in 1956 against Hungary and in 1968 against Czechoslovakia; war between the Soviet Union and the People's Republic of China was a serious possibility for two decades after the Sino-Soviet split in 1962; and armed conflict erupted between China and Vietnam after the latter country became the most powerful in Southeast Asia. Finally, the theory does not provide for wars of liberation against socialist states, such as that conducted by the Afghan mujahideen against the Soviet Union from 1979 to 1989.

      Many theories claim or imply that wars result ultimately from the allegiance of men to nations and from the intimate connection between the nation and a state. This link between the nation and the state is firmly established by the doctrine of national self-determination, which has become in the eyes of many the major basis of the legitimacy of states and the major factor in their establishment and breakup. It was the principle on which the political boundaries of eastern Europe and the Balkans were arranged after World War I and has been the principal slogan of the anticolonial movement (colonialism, Western) of the 20th century, finding expression in Chapter I, article 1, of the Charter of the United Nations in the objective of “self-determination of peoples,” as well as in the more specific provisions of Chapters XI and XII. It is this intimate link between nationalism and statehood that renders them both so dangerous. The rulers of a state are ultimately governed in their behaviour by what is loosely summed up as the “national interest,” which occasionally clashes directly with the national interests of other states.

      The ideal of the nation-state is never fully achieved. In no historical case does one find all members of a particular nation gathered within one state's boundaries. Conversely, many states contain sizable national minorities (minority). This lack of full correlation has frequently given rise to dangerous tensions that can ultimately lead to war. A government inspired by nationalism may conduct a policy aiming at the assimilation of national minorities, as was the general tendency of central and eastern European governments in the interwar period; it may also attempt to reunite the members of the nation living outside its boundaries, as Adolf Hitler did. National groups that are not in control of a state may feel dissatisfied with its regime and claim self-determination in a separate state, as demonstrated in the attempt to carve Biafra out of Nigeria and the separation of Bangladesh from Pakistan.

      There is no rational basis for deciding on the extent to which the self-determination principle should be applied in allowing national minorities to break away. As a rule, the majority group violently opposes the breakaway movement. Violent conflicts can ensue and, through foreign involvement, turn into international wars. No suitable method has been found for divorcing nationalism from the state and for meeting national demands through adequate social and cultural provisions within a larger unit. Such an attempt in the Austro-Hungarian Empire before its dissolution in World War I failed. Whether the Soviet Union will be permanently successful in containing its large proportion of national minorities remains to be seen.

      Nationalism not only induces wars but, through the severity of its influence, makes compromise and acceptance of defeat more difficult. It thus tends to prolong the duration and to increase the severity of wars. Possibly, however, this is the characteristic only of new, immature nationalisms, for nationalism has ceased to be a major cause of conflict and war among the nations of western Europe.

      Nationalism is but one form of ideology: (ideology) in all ages people seem to develop beliefs and try to proselytize others. Even within particular ideological groups schisms result in conflicts as violent as those between totally opposed creeds, and heretics are often regarded as more dangerous and hostile than opponents. As long as individual states can identify themselves with explosive differences in beliefs, the probability of a war between states is increased, and its intensity is likely to be greater.

Special-interest groups (interest group)
      Whereas some theories of war regard the state as an undifferentiated whole and generalize about its behaviour, other theorists are more sociologically oriented and focus on the roles played within the state by various special-interest groups.

      A distinction is made by these theorists between the great mass of people and those groupings directly involved or influential with government. The people, about whose attitudes adequate knowledge is lacking, are generally assumed to be taken up with their daily lives and to be in favour of peace. The influential groups, who are directly involved in external affairs and, hence, in wars, are the main subject of analysis. Warlike governments dragging peace-loving people into international conflict is a recurrent theme both of liberal and socialist analyses of war. Some writers have gone to the length of postulating a continuous conspiracy of the rulers against the ruled that can be traced to prehistoric times, when priests and warriors combined in the first state structures. Most writers, however, narrow the field and seek an answer to the question of why some governments are more prone to engage in war than others; and they generally find the answer in the influence of important interest groups that pursue particular and selfish ends.

      The chief and most obvious of such groups is the military. Military prowess was a major qualification for political leadership in primitive societies; the search for military glory as well as for the spoils of victory seems to have been one of the major motivations for war. Once the military function became differentiated and separated from civilian ones, a tension between the two became one of the most important issues of politics. The plausible view has generally been held that the military strive for war, in which they attain greater resources and can satisfy their status seeking and sometimes, also, an aspiration for direct and full political power. In peacetime, the military are obviously less important, are denied resources, and are less likely to influence or attain political power directly. At the same time, a second, although usually subsidiary, consideration of the military as a causal agent in war holds that an officer corps is directly responsible for any fighting and is thus more aware of its potential dangers for its members and for the state as well. Although intent on keeping the state in a high state of preparedness, the military may be more cautious than civilians about engaging in war. It is often held, however, that increased military preparedness may result in increased tensions and thus indirectly lead to the outbreak of war.

      Closely allied are theories about groups that profit from wars economically—capitalists and the financiers, especially those involved in industries (industry) catering to war. All of these play a central part as the villains of the piece in socialist and the liberal theories of war, and even those not subscribing to such theories do not deny the importance of military-industrial complexes (military-industrial complex) in countries in which large sectors of the economy specialize in war supplies. But, although industrialists in all of the technologically advanced systems are undoubtedly influential in determining such factors as the level of armaments to be maintained, it is difficult to assume that their influence is or could be decisive when actual questions concerning war or peace are being decided by politicians.

      Finally, some scientists (science) and technologists constitute a new, much smaller, but important group with special interests in war. To some extent one can generalize about them, although the group is heterogeneous, embracing as it does nuclear scientists, space researchers, biologists and geneticists, chemists, and engineers. If they are involved in defense work, they all share the interest of the military in securing more resources for their research: without their military applications, for example, neither nuclear nor space research would have gone ahead nearly as fast as it has. War, however, does not enhance the status and standing of scientists; on the contrary, they come under the close control of the military. They also usually have peaceful alternatives to military research, although these may not be very satisfactory or ample. Consequently, although modern war technology depends heavily upon scientists, and although many of them are employed by governments in work directly or indirectly concerned with this technology, scientists as a group are far from being wedded to war. On the contrary, many of them are deeply concerned with the mass destruction made possible by science and participate in international pacifist movements.

The control of war
      The international environment within which states and the people within them operate is regarded by many theorists as the major factor determining the occurrence and the nature of wars. War remains possible as long as individual states seek to ensure self-preservation and to promote their individual interests and—in the absence of a reliable international agency to control the actions of other states—rely on their own efforts. It is no accident that reforms of the international system figure prominently in many prescriptions for the prevention of war. Whereas the reform of human propensities or of the state is bound to be a long, drawn-out affair, if it is at all possible, relatively straightforward partial reforms of the international system may produce significant restraints upon resorting to war, and a thorough reform could make war impossible.

      Some theorists, being more optimistic about the nature of states, concentrate upon the removal of the fear and suspicion of other states, which is characteristic of the present as well as of all historical political systems; others, being less optimistic, think mainly of possible controls and restraints upon the behaviour of states. The underlying reasoning of both parties is generally similar. If individual states in competitive situations are governed by a short-term conception of their interests, acute conflicts between them will occur and will show a strong tendency to escalate. Thus, one state erects a tariff barrier to protect its industry against the competition of a trade partner, and the partner retaliates, the retaliatory interaction being repeated until the two countries find themselves in a trade war. Armaments races show a similar tendency to escalate, particularly so in an age of rapid technological change. The economic and the scientific efforts necessary to avoid falling behind rivals in the invention and development of rapidly improving weapons of mass destruction have already reached unprecedented heights.

      And yet, neither trade wars nor arms races necessarily end in violent conflict; there seem to be operating some restraining and inhibiting factors that prevent an automatic escalation. Much of the theory of war concerns itself with the identification, improvement, and development of these restraining factors.

      The outcome of starkly competitive behaviour leading to wars is clearly against the interests of states, and it is rational for them to seek more desirable outcomes. If competitive behaviour is dangerous, theorists seek for alternative methods of cooperative behaviour that would not jeopardize the interests of the state through exposing it to the possibly less cooperative behaviour of others. Some theorists concentrate upon improving the rationality of the decision-making of individual states through a better understanding of the international environment, through eliminating misperceptions and irrational fears, and through making clear the full possible costs of engaging in war and the full destructiveness of an all-out war, possible in our age.

      The relative paucity of wars and their limited nature throughout the century following the Napoleonic Wars (1815–1914) have stirred great theoretical interest in the nature of the balance-of-power (power, balance of) system of that period—that is, in the process by which the power of competing groups of states tended toward a condition of equilibrium. Contributing to the successful operation of the balance-of-power system of the 19th century were relatively slow technological change, great diversionary opportunities for industrial and colonial expansion, and the ideological and cultural homogeneity of Europe. Pursuit of a balance of power is a way of conducting foreign policy that is perhaps less prone to war than other types of policy because, instead of indiscriminately increasing their power, states increase it only moderately, so as not to provoke others; and instead of joining the strongest, they join the weaker side in order to ensure balance. States in a balance-of-power system must, however, be ready to abide by constraints upon their behaviour in order to ensure stability of the system.

      The application to international relations of a branch of mathematicsgame theory—that analyzes the strategy of conflict situations has provided a new tool of analysis. In state interaction, as in any game situation, one side's strategy generally depends upon that side's expectations of the other side's strategy. If all sides in a game are to maximize their chances of a satisfactory outcome, it is necessary that some rational rules of behaviour be conceptualized and agreed upon, and this idea of a set of rational rules can be applied to competing states in the international system. Game theorists distinguish antagonistic situations called zero-sum games in which one state's gain can be only at the expense of another state because the “payoff” is fixed. Even then a mutually acceptable distribution of gains can be rationally reached on the basis of the “minimax” principle—the party in a position of advantage satisfies itself with the minimum acceptable gain because it realizes that the other party, in a position of disadvantage, would yield on the basis of its possible minimum loss but would violently oppose a distribution even more to its detriment. In other situations called non-zero-sum games, the payoff is not constant but can be increased by a cooperative approach; the gain of one participant is not at the cost of another. The contestants, however, have to agree about the distribution of the gain, which is the product of their cooperation.

      The theory of games is the foundation of theories of bargaining that analyze the behaviour of individual states in interaction. Diplomacy based upon such theories is less likely to lead to war. Policymakers pursuing such strategies will conduct conflicts of the zero-sum type so that war is avoided. More than that, with some skill, such situations can be transformed into the non-zero-sum type by introducing additional benefits accruing from cooperation in other interactions and also, more generally, by eliminating the likelihood of war and, consequently, by reducing the costs of preparing for one.

Regional integration
      Because wars within states have been eliminated through the establishment of suitable political structures, such as central governments that hold a monopoly of coercive power, many theories concentrate upon the establishment of parallel structures (international agreement) within the international context (international organization). Regional integration (cooperation in economic (European Community), social, and political affairs, as, for example, within the European Economic Community) and the establishment of security communities, such as the North Atlantic Treaty Organization, have made much greater advances than attempts at the reform of the entire, global international system.

      Because conflicts among neighbours tend to be frequent, regional integration is an important advance toward reducing the incidence of war. Even if it were to become generally successful, however, regional integration would simply shift the problem of war to a different level: there would be fewer possibilities of war because intraregional conflicts would be contained, but interregional conflicts could still give rise to wars of much greater scope and severity. The phenomenon of war (war, law of) must, therefore, be analyzed at the universal level.

International law
      Some of the most influential thinking about war and the international system has come from specialists in international law. All of them postulate that there exists an international society of states that accepts the binding force of some norms of international behaviour. These norms are referred to as international law, although they differ fundamentally from municipal law because no sovereign exists who can enforce them. Most international lawyers realistically accept that international law is, consequently, among rather than above states. It is, according to legal doctrine, binding on states, but unenforceable.

      International law concerns itself largely with two aspects of war: its legality and its regulation. (For the regulation of warfare, see war, law of.) As far as the legality of war (just war) is concerned, there has arisen in the 20th century a general consensus among states, expressed in several international treaties, including the Covenant of the League of Nations (Nations, League of), the Kellogg–Briand Pact of 1928 (Kellogg-Briand Pact), and the Charter of the United Nations, that resort to armed force, except in certain circumstances, such as self-defense, is illegal. Such a legalistic approach to the prevention of war, however, remains futile in the absence of a means of enforcement. The enforcement provisions of the Covenant of the League of Nations and those of the United Nations Charter, which entail the application of military and economic sanctions, have never been applied successfully, owing to political disagreement among the major powers. This underlines the fact that legal norms, to be effective, must reflect an underlying political reality.

The United Nations (United Nations)
      The United Nations is charged with the maintenance of international peace and security. The several approaches to peace outlined in its Charter and developed in its practice are based upon and clearly reflect the cumulative development of the relevant theories of war.

      Drawing heavily upon the experience of the League of Nations, the Charter develops three interrelated approaches: first, pacific settlement of disputes, which would leave nations with nothing to fight about; second, collective security, which would confront aggressors with too much to fight against; and third, disarmament, which would deprive them of anything substantial with which to fight.

Peaceful settlement of disputes
      Pacific settlement of disputes is based upon the assumption that war is primarily a technique for settling disputes, although it can, of course, also serve other purposes, such as allaying fears and seeking status. Further assumptions are that war frequently comes about because of the unawareness of decision makers of the possibility of settling disputes peacefully to the mutual advantage of both sides—an unawareness due to mere ignorance, pride, lack of imagination, or selfish and cynical leadership. It is thus possible that international organizations can contribute to the prevention of wars by devising and institutionalizing alternative, peaceful techniques for the settlement of disputes and by persuading the states to use them.

      The scope of this approach is limited, for states are notoriously reluctant to abide by impartial findings on matters they regard as being of vital importance. Hence, what the procedures really offer is a means of slowing down the progression of a dispute toward war, giving reason a chance to prevail.

      Collective security is an approach to peace involving an agreement by which states agree to take collective action against any state defined as an aggressor. Leaving aside the problems of settling disputes or enforcing law or satisfying justice, it concentrates upon forestalling violence by bringing to bear an overwhelmingly superior international force against any aggressor. Although collective security, in somewhat different forms, played a prominent part in the League of Nations Covenant and is embodied in the United Nations Charter, it has completely failed in both cases. Failing an international government capable of ultimately determining the issues, nations have not managed to agree on an unequivocal definition of aggression, have not in practice accepted the principle that aggression must be acted against independently of the identity of the perpetrator, and, therefore, have not established the international collective security force envisaged in the Charter.

      Disarmament and limitation of armaments (arms control) are based upon the theory that states are inclined to strive for dominance in arms over any potential rivals, and that this leads to arms races that tend to end in war. The major besetting sin of this theory is that it often tends to confuse cause with effect. Although arms races develop momentum of their own, they are themselves the result of political tensions leading to war. In short, it is the tensions that cause war, not the arms races. To hold otherwise is to mistake a symptom for a cause. Hence, reducing the levels of armaments does not necessarily reduce these tensions. Furthermore, it is the instability of strategic balances, rather than their level, that leads to war; agreements about disarmament or limitation of armaments may easily disturb the existing precarious balance and, therefore, be actually conducive to war.

Limiting conflict
      As these major approaches to peace envisaged in its Charter have not proved very fruitful, the United Nations has developed two new procedures aiming at the limitation of wars. First, “preventive diplomacy,” largely comprising the diplomatic initiatives of the secretary-general and the stationing of peacekeeping forces, has served to contain local conflicts and to prevent escalation, especially the involvement of the superpowers. Second, although the General Assembly's (General Assembly, United Nations) recommendations have no legal binding force, they have become increasingly influential, for by the mid-1970s the assembly was becoming an important agency for what has been called the collective legitimization of state policies. Resort to war becomes more costly when a state is faced with the prospects of a collective condemnation. This new restraint upon war does not, however, act upon conflicts that the assembly may favourably regard as wars of colonial liberation. Nor could the assembly's disapproval be relied upon to deter states from waging war in pursuit of an interest they deemed to be truly vital.

World government
      Both the shortcomings and the limited practicability of all the approaches to the elimination of war through the reform of the international system have driven many thinkers to accept the idea that war can only be abolished by a full-scale world government. No midway solution between the relative anarchy of independent, individual states and a world government with the full paraphernalia of legislative powers and of an overwhelming military force would provide a sufficiently stable international framework for the nations to feel that wars would not break out and thus stop them from behaviour that is often conducive to wars. In an age faced with the danger of a war escalating into a general extermination of mankind, the central importance of preserving peace is obvious and is generally accepted. But here the thinkers divide. Some press on from this analysis to the logical conclusion that mankind must, and, therefore, will establish a world government, and they advance ideas how best to proceed in this direction. Others regard the world government as completely utopian, no matter how logical and desirable it may be. Yet, in terms of actual policies, the adherents of the two schools do not necessarily divide. Whether they do or do not believe that world government is attainable, they do agree that the complex phenomenon of war represents a potential calamity of such a magnitude that all theorists must endeavour to understand it and to apply their understanding to the prevention and mitigation of war with all the means at their disposal.

Joseph Frankel Ed.

Additional Reading
Carl von Clausewitz, On War, 3 vol. in 1 (1873; originally published in German, 3 vol., 1832–34), remains a classic on the theory of war and is available in many later editions both in the original and in English translation, of which the one edited by and with commentary by Michael Howard and Peter Paret (1976) can be recommended. Other outstanding classical philosophical treatments are Immanuel Kant, Perpetual Peace: A Philosophical Essay (1903, reissued 1972; originally published in German, 1795), also available in later editions, some entitled Eternal Peace; John Stuart Mill, On Liberty (1859) and Considerations on Representative Government (1861), both available in the selection published as Political Writings (1981), in “The Great Books of the Western World” series; and Jean-Jacques Rousseau, A Lasting Peace Through the Federation of Europe, and The State of War, trans. from French (1917).Explanations of war as a product of imperialism are found in J.A. Hobson, Imperialism, 3rd rev. ed. (1938, reprinted 1988); and in Marxist writings. Psychological theories of war are best expressed in Sigmund Freud, Civilization, War, and Death, new ed., ed. by John Rickman (1953, reprinted 1968); and ethological theories in Robert Ardrey, The Territorial Imperative (1966, reissued 1978); and Konrad Lorenz, On Aggression (1966, reprinted 1974; originally published in German, 1963). Norman Angell, The Great Illusion: A Study of the Relation of Military Power in Nations to Their Economic and Social Advantage (1910), is an early economic study, available in many later editions. Reinhold Niebuhr, Moral Man and Immoral Society (1932, reprinted 1960), analyzes war from the ethical point of view.A comprehensive modern analysis is Quincy Wright, A Study of War, 2nd ed. (1964). Other major contemporary general analyses are Raymond Aron, The Century of Total War (1954, reprinted 1985); Kenneth N. Waltz, Man, the State, and War (1959, reprinted 1965); and Hans J. Morgenthau and Kenneth W. Thompson, Politics Among Nations, 6th ed. (1985). On nuclear war, see Herman Kahn, On Escalation: Metaphors and Scenarios (1965, reprinted 1986). Inis L. Claude, Jr., Swords into Plowshares, 4th ed. (1971, reprinted 1984), discusses United Nations approaches to peace. Later studies include Evan Luard, War in International Society: A Study in International Sociology (1986), a broad and systematic view of war in history; J. David Singer et al., Explaining War: Selected Papers from the Correlates of War Project (1979); and Melvin Small and J. David Singer, Resort to Arms: International and Civil Wars, 1816–1980, rev. ed. (1982).Joseph Frankel

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Universalium. 2010.

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