French sociologist Maurice Duverger conducted extensive studies of political systems and found that systems with “winner-take-all” elections, combined with single-member districts for legislative bodies, nearly always have two dominant political parties and countries with various forms of proportional representation (such as ranked choice voting, with at-large elections or multiple member districts) nearly always had more than two political parties that win seats in legislatures.
Within a two-party system (a "duopoly") it is easier for special interests, especially those with a lot of money, to corrupt the electoral process and gain a controlling interest in the government.
Both winner-take-all elections, with single member districts, and the two-party systems that result, violate the primary rule of representative democracy - representation for all voters in proportion to their numbers - leaving many voters unrepresented. This is why implementing ranked choice voting is the key to getting all of the other reforms needed implemented.
This video does a good job of illustrating how "Winner-Take-All" elections and single-member districts nearly always lead to a "two-party" system. If we want more than two-parties from which to choose, we must move to ranked choice voting with multiple member districts.
This video also includes a brief explanation of "gerrymandering" and the "spoiler effect", which can also be eliminated by moving to ranked-choice voting.
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