The principle that states' plurality-rule electoral systems will tend to have two-party systems while countries with proportional representation will tend to have multiparty systems is known as

Question

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Duverger's Law states that plurality-rule electoral systems tend to result in a two-party system, while proportional representation systems tend to produce multiparty systems. This is because in plurality-rule systems, voters feel pressure to vote for one of the two major parties in order to avoid "wasting" their vote, while proportional representation allows for smaller parties to gain representation and compete for seats.

The Principle That States' Plurality-Rule Electoral Systems Will Tend to Have