A wise black friend once told me that the blacks that left the south for the big cities were the blacks who were rebelling away from their black Christian roots. They wanted to escape being subject to any one telling them what was right, accountability. I have no idea if this is true, but this is what an older black once told me.
Blacks would not have come North if there had been no jobs to come to.
I was told something similar by a black dude in his late sixties ( during the eighties) He seemed genuinely embarrassed by the actions of his bretheren.
He said it was a myth that southern blacks came up north seeking factory jobs, when in fact, they were actually seeking northern liberal policies and welfare hand outs. I lived (visited) for a while with a southern black family in ‘87 and the first thing they said was “we all work for a living down here-yem”