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For sake of argument, let's say that somewhere between 1910 and 1913, progressive members of Congress manage to amend the Constitution to provide for a system of mixed member proportional representation in the House (There's no specific POD here, but that doesn't really matter--my aim here is to discuss the possible development of American political parties should PR be introduced to some degree).

The amendment I'm making up off of the top of my head would be something like this--1/3 of the House would be elected by national-list proportional representation with an electoral threshold of 1%. So that's 145 members elected by means of proportional representation. Supposing we start this off in 1912, how are later national elections effected? How do American political parties grow and react in response?

Off of the top of my head, I can think of quite a few parties that are going to experience rapid growth from this kind of law. The nascent Progressive Party of Theodore Roosevelt got 2% of the national vote in the House IOTL, and with this kind of amendment, I would expect it to be higher. I also foresee the Socialists and the Prohibitionists, of all people, making significant gains should we start this in 1912. Of course, the Prohibitionists will likely whiter away by the time their crown jewel--the 18th Amendment--comes into force, but they'll nonetheless be a player early on.
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