Duverger's Law states that single-member districts result in two-party systems.

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Duverger's Law is a political theory that suggests that countries using a single-member district system to elect representatives tend to develop two-party systems over time. This is due to the fact that voters tend to vote strategically and choose between the two most viable candidates rather than wasting their vote on a third-party candidate who is unlikely to win. As a result, third-party candidates struggle to gain traction and remain competitive in such a system.

Duverger's Law States That Single-Member Districts Result in Two-Party Systems