The shift began earlier with Roosevelt and the New Deal.
The shift began earlier, but I have seen graphs of black voter registration from the 1960s and later, and they may have started moving during the Roosevelt era, but they switched completely in the seven years after 1964.
“The shift began earlier, but I have seen graphs of black voter registration from the 1960s and later, and they may have started moving during the Roosevelt era, but they switched completely in the seven years after 1964.”
I think this is correct.
But, I was surprised when I learned how much had shifted prior to the 60’s.