We may not all remember prejudice against Jews, but it existed strongly enough that FDR didn't save a shipload of them who had gotten out of Europe but couldn't find assylum anywhere.In fact, FDR was told about the death camps but didn't want to make an issue of them for fear that (the majority of) Americans who had been pacifist while FDR had worked to get America into WWII would say, "So that's what getting us into this war was about! Saving a bunch of Jews!"
Recall that Ronald Reagan's father once slept outside in his car instead of in a hotel whose clerk gratuitously boasted of excluding Jews.
So we really have to understand patience. How many generations from the end of the Civil War to the 1994 election of enough southern Republicans to take the House of Representatives?
I'm afraid that might be the frame of reference in which we have to think . . .