Duverger's law
Winner-takes-all voting systems tend to result in only two viable parties / From Wikipedia, the free encyclopedia
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In political science, Duverger's law (/ˈduvərʒeɪ/ DOO-vər-zhay) holds that in political systems with only one winner (as in the U.S.), two main parties tend to emerge with minor parties typically splitting votes away from the most similar major party.[1][2] In contrast, systems with proportional representation usually have more representation of minor parties in government.[3]