two-party system

two-party system
/tooh"pahr'tee/, Govt.
a political system consisting chiefly of two major parties, more or less equal in strength.

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      political system in which the electorate gives its votes largely to only two major parties and in which one or the other party can win a majority in the legislature. The United States is the classic example of a nation with a two-party system. The contrasts between two-party and multiparty systems are often exaggerated. Within each major party in the United States, the Republicans and the Democrats, many factions are struggling for power. The presence of divergent interests under a single party canopy masks a process of struggle and compromise that under a multiparty system is out in the open.

      Major influences favourable to the two-party system are the use of single-member districts for the election of representatives, the presidential system, and the absence of proportional representation. In Great Britain (United Kingdom) and the United States members of the national representative assemblies are chosen from single-member districts, and the candidate polling the largest number of votes is the winner. Such an electoral system compels a party to strive for a majority of the votes in a district or other electoral area. Usually only two fairly evenly matched parties may successfully compete for office in a single-member district, and a third party suffers recurring defeat unless it can swallow up one of the other parties. Parties do not thrive under the certainty of defeat. A third party may have a substantial popular following and yet capture few seats in the representative body. With, for instance, 20 percent of the popular vote spread evenly over an entire country, such a party would not win a single seat. (Under full proportional representation, it would be entitled to 20 percent of the seats in a legislative body.) The rise of the Labour Party in Great Britain, for example, virtually deprived the Liberal Party of parliamentary seats even when it had a substantial popular following.

      In addition to the single-member-district system, in the United States the presidential system induces parties to seek majority support. No fractional party can elect its presidential candidate, and third parties in national politics have proved to be protest movements more than serious electoral enterprises.

      The two-party system is said to promote governmental stability because a single party can win a majority in the parliament and govern. In a multiparty country, on the other hand, the formation of a government depends on the maintenance of a coalition of parties with enough total strength to form a parliamentary majority. The weakness of the ties that bind the coalition may threaten the continuance of a cabinet in power. The stability shown by the government of the United States has not been entirely due to its party system, it has been argued, but has been promoted also by the fixed tenure and strong constitutional position of the president.

      The two-party system moderates the animosities of political strife. To appeal for the support of a majority of voters, a party must present a program sympathetic to the desires of most of the politically active elements of the population. In the formulation of such a program an effort must be made to reconcile the conflicting interests of different sectors of the population. This enables the party, if expedient, to resist demands that it commit itself without reservation to the policies urged by any particular extremist element. In effect, the party is a coalition for the purpose of campaigning for office. In Great Britain and Canada differences in program and in composition between the two major parties have been perhaps greater than in the United States. Nevertheless, in all of these countries a broad area of agreement exists among the leading parties. With two major parties of similar views and of approximately equal strength competing for control of a government, it is possible for governmental control to alternate between the parties without shifts in policy so radical as to incite minorities to resistance.

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Universalium. 2010.

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