WI: USA goes Proportional Democracy

It could weaken the US position in the Cold War. Since both parties tended to endorse the typical anti-communist mantra and not really have a left of center-economic policy the break of the two-party system would inevitably lead to representation for maybe not only a social democratic party, but also a more hardline socialist or even communist party, maybe associated with the Civil Rights Movement. Politics would become more ideological in the sense of party-discipline and not allowing a free vote for the representatives. In conclusion, there would be no reason for the main parties to further claim being non-ideological big tent-parties, which could lead to the drop of the ridiculous names "democrat" and "republican" (in Turkey for example, the peoples republican party is a center-left party, not a right -wing one, historically "republicanism" is not associated with rightist conservative politics) instead opting for "liberal" and "conservative" parties.
The democrats could split up, one split merging with a social democratic union-orientated party, one forming a relatively pro-business socially liberal party and the last part becoming far right-wing dixiecrats strongly connected to religion in politics and extreme social conservatism.
The conservative party could turn out to be the biggest party in Congress, policy ideas somewhat more moderate to stop leftist parties from receiving support, maybe like Richard Nixon, supporting universal health care, price controls, etc. but remaining strongly anti-communist and strategical in foreign policy.
The remaining party having representation in Congress could be a far-left party, maybe supporting maoist China instead of the soviet union. At least this could be a bit funnier and more interesting to watch.

Obviously, a proportional representation-system would allow for more left-wing movements to gather public recognition through Congress. I could only see the us-political landscape moving towards the left, the question is, how much. Maybe not too much, but still enough to see post WW2-politics going into an entirely different direction, impacting in my opinion less whether USSR tirns out to be significantly stronger but rather whether something like a strong reaganite-thatcherite movement in the western world calling for vast deregulation and setting the start point for globalization leading to the world we know today, can emerge. Maybe the theory that us and ussr systems come closer towards each other could prove to be somewhat true with the us implementing more social reform and ussr implementing more liberal reform, both remaining relatively bureaucratic and knocked upon "cannons and butter", however.
 
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