The USA – the supposed “cradle of modern democracy” and the supposed “beacon of democracy” to the world – has the stupidest system, in so many ways.
This is one of them. If there were proportional representation, then the percentage of votes your party wins, would mean that percentage of representatives from your party would be seated.
That’s just one of the many ways “our” representative democracy is a mess from the get-go.
We need an independent constitutional commission to upgrade US democracy. Abolish the Senate, and abolish the Electoral College (both are hold-overs from the “founding fathers” protection of slaveholders). Abolish the idiotic “single non-transferable vote” plurality voting system for single-winner seats, and replace it with ranked choice voting, score voting or approval voting so you have your input on EVERY candidate (to end the “lesser of two evils” and the “wasted vote” problems, weaken the duopoly, and strengthen multiple parties). Institute multi-representative districts with proportional representation (no more gerrymandering, etc.). Etc. etc. etc.