What is the most widely accepted theory for the existence of the American two-party system?

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The most widely accepted theory for the existence of the American two-party system is institutional. This theory suggests that the structure of the American political system, particularly with the winner-take-all system and single-member districts, naturally lends itself to a two-party system. It also highlights the importance of political institutions such as the Electoral College and the legislative process in reinforcing the dominance of the two major parties.

What Is the Most Widely Accepted Theory for the Existence