Seriously? The entire white south used to vote Democrat, the entire black south Republican. That completely reversed in the 1960s with the Republicans' conscious 'Southern Strategy' to gain the white Southern conservative vote. The entire white south switched parties to become Republicans, and the entire black South did the opposite:
http://en.wikipedia.org/wiki/Southern_strategy
Do you think that's just a coincidence, or didn't have consequences?
Nixon's campaign manager: "From now on, the Republicans are never going to get more than 10 to 20 percent of the Negro vote and they don't need any more than that... but Republicans would be shortsighted if they weakened enforcement of the
Voting Rights Act. The more Negroes who register as Democrats in the South, the sooner the Negrophobe whites will quit the Democrats and become Republicans. That's where the votes are. Without that prodding from the blacks, the whites will backslide into their old comfortable arrangement with the local Democrats."