The question of Parliamentary vs. Presidential is orthogonal to that of Proportional vs. Plurality. (Sorry if that terminology just makes things more confusing

The question of Parliamentary vs. Presidential is orthogonal to that of Proportional vs. Plurality. (Sorry if that terminology just makes things more confusing). To give a concrete example, the UK uses the same plurality voting system as (most of) the US, which leads to the same two-party dynamics, even though the UK has a parliamentary system. There's nothing stopping US states from adopting a more proportional system while keep Congress and the Presidency the same. In fact, Maine adopted Ranked Choice Voting to achieve that in 2018, and Alaska followed this year[0]. (Actually RCV is not guaranteed to produce more proportional results, but it can stop vote-splitting and lesser-of-two-evils tactical voting, which makes the outcomes better reflect the true wishes of the voters). [0] https://en.wikipedia.org/wiki/Ranked-choice_voting_in_the_United_States https://en.wikipedia.org/wiki/Ranked-choice_voting_in_the_Un...