I figure it'll be another two, three generations tops before tribal warfare, AIDS from all the child-rape and monkey sex, plague from poor hygeine, and famine from giving farms to dumb fuckers will wipe out most of sub-saharan Africa.
In the meantime, the U.N. will demand that the U.S. send money to those poor people, imbezzle most of it, then give it to the corrupt African governments that will imbezzle the rest and screw the general population over yet again. "Peacekeepers" will be sent in to start illegal child prostitution and pornography rings, imbezzle any remaining funds, and make fun of the dumb Americans.
So... Anyone want to organize an expedition to the Dark Continent and stake out some land while we can? We'll form the Republic of ARFCOM and make the GNP the arms trade. There should still be some there when we colonize the ruined wastelands. Let's get there before the U.N. starts divying out national borders!