These are introductory resources for understanding why winner-take-all elections are detrimental to representation in America, how proportional representation can fix that problem, the historical evidence for proportional representation success in the United States, and the mechanisms for how proportional representation and single-transferrable vote (STV) works.
These resources explain why winner-take-all elections leave so many people without representation and why, despite all the success we’ve had with getting the right to vote, America still seems broken.