One should note that American Left is literally only left by weird American standards.
Literally everyone outside Land of the free will tell you Dems are moderate rights, and the truth is super far from “between Dems and Reps”.
America hasn’t seen a healthy political debate since the Red Scare. With the real left eradicated and members of any left organizations, let alone past or current member of the communist parties, becoming essentially enemies of the state, politicians felt comfortable instating that Dems are “actually left”, so as to gradually put real left to serve a slightly leftier flavor of capitalists.
And as such, you don’t see the actual unbiased debate you expect. You see two kinds of right-wingers debating how right America should go.
Real “unbiased” center, by international standards, is more left than Democrats, even. It’s around Bernie Sanders.
And the left is about dismantling capitalism and building a real socialist state. Like, USSR socialist, not Sweden “socialist”.