and all those laws were overturned by the 13th, 14th and 15th amendments. But then Jim Crow (ie apartheid) laws came along, mostly in the south. what's your point?
My point is that the North hated blacks more and did not allow them any opportunity to do anything. They could not own land, no jobs were available, they were not allowed to practice any kind of trade.
In the South, some of the most wealthy plantation owners were blacks even. Some of the best and most talented craftsman were blacks. Blacks shared houses with whites in the South, farmed the land together, grew up together.
In the North, their throats were just cut or were beaten to death in alleyways and driven out. If you were black, the North would have been the place you would want to avoid.