The fact that proves that the black vote is unique and based on something unpleasant, is that until 1936 blacks voted republican in every presidential election, 1932 was typical with about 70% of the black vote going GOP, and no one has any trouble understanding that.
Suddenly in 1936, the black vote went democrat by 70%, it totally reversed itself into the exact mirror image of what it had been for the republicans, a permanent, massive majority vote, in every single election, for the democrats.
There was no “growth” or “gradual change”, or an “increasing movement towards the democrats”, it was a total, instant reversal, done all at once, during the 4 years from 1932, to 1936.
And what was the reason for the sudden HUGE reversal in 1936? The Great Depression? FDR promising to take care of them with Federal largesse ? If that’s the reason, then Rush Limbaugh is right — It’s hard to fight Santa Claus ( until of course Santa runs out of toys to give ).