Two-Party System
A political system dominated by two major parties that alternate in power, with minor parties playing a marginal role.
Explanation
A two-party system is one where two major parties dominate elections and governance, winning nearly all seats and alternating in government. The United States (Democrats and Republicans) is the clearest example. The UK has historically been a two-party system (Conservative and Labour) though smaller parties play a growing role. Two-party systems are strongly associated with first-past-the-post voting, which makes it very hard for third parties to win seats. Duverger's Law describes this pattern: winner-take-all elections tend to produce two dominant parties. Voters face a limited choice but get clear governing mandates. Frustration with two-party dominance is a common driver of electoral reform movements.
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