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

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Duverger's Law states that plurality-rule electoral systems tend to produce two-party systems, while proportional representation electoral systems lead to multiparty systems. The law is named after French sociologist Maurice Duverger, who first observed this phenomenon in his 1954 book Political Parties.

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