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There is nothing magic about two parties, in fact there are plenty of other parties even in the US. However due to game theoretic mechanisms [1] in the winner-

There is nothing magic about two parties, in fact there are plenty of other parties even in the US. However due to game theoretic mechanisms [1] in the winner-takes-all system we tend to get two dominant parties. I'm not sure how this could be avoided in the US system of 2 senators per state. You can't exactly send 2/3ds of a senator to Washington if you had a proportional system. [1] https://en.wikipedia.org/wiki/Duverger%27s_law https://en.wikipedia.org/wiki/Duverger%27s_law

Alpha3031 3y ago
> I'm not sure how this could be avoided in the US system of 2 senators per state. You can't exactly send 2/3ds of a senator to Washington if you had a proportional system. Make the state legislatures proportional, impose a deadlock-free contingency procedure and repeal the seventeenth amendment. Either that or random ballot. Though, I wouldn't necessarily consider either of those good ways of solving that problem, which would probably involve increasing the size of the senate as well somehow.