It’s their own damn fault. They voted for Roosevelt and his new deal.
The Republicans weren’t (and aren’t) all that great, either.
Because the Republicans had done soooooooooo much for the South at that point.
FDR was the first national leader to recognize the problem of an impoverished South. I don’t like his solutions, but he was the first one to say something was wrong. At least he backed the South on the railroad fight.