Political systems with only one winner that fail the sincere favorite criterion typically result in two-party rule.[1][2]
https://en.m.wikipedia.org/wiki/Duverger%27s_law
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Wikipedia 
Duverger's LawPolitical systems with only one winner that fail the sincere favorite criterion typically result in two-party rule.[1][2]
https://en.m.wikipedia.org/wiki/Duverger%27s_law
HEIGHT 400
Wikipedia