Drive immigrants to area of the city. Free black were immigrants? So you are admitting that immigrants are kept on the plantation. Immigrates go the area of the city they feel comfortable. Can we say China Town in San Francisco. 

Black fled the south to be met by bigoted and racist whites. Interesting. Why would anyone do that? And why would they stay? 

"In recent years states like Texas, Maryland, Georgia have seen a return of educated minorities back to their states". And in recent years what political party has controlled Texas, and Georgia? Imagine that.