"To discover to the world something which deeply concerns it, and of which it was previously ignorant; to prove to it that it had been mistaken on some vital point of temporal or spiritual interest, is as important a service as a human being can render to his fellow creatures..."
John Stuart Mill, "On Liberty"
Once upon a time the South was a solid Democratic block of votes. Many of those segregationist senators that Joe Biden recently talked about were in fact Democrats. Republicans just didn't get elected from there. And then things changed. The civil rights movement, the voting rights Act, the trailing impact of demographic change from the great migration, and broader cultural changes, including the rise of feminism, all provided an opportunity for Republicans in the South to exploit racial, social and cultural divides.
Today we are living with arguably the apogee that effort.