America, Russia, and China would buy a large tract of land in Africa, put infrastructure on it, and then give people financial incentive to move there.
First, cut all welfare for all able-bodied people in America, but give welfare cards, that are usable only outside of America, to those who were on welfare and agree to move out of America for good. Thus, they can go wherever else in the world they want, or to the joint venture in Africa. The joint venture in Africa would use the natural resources there to fund it, and factories providing high paying jobs would be built on it.
You give them welfare from America, but they can only have it if they agree to live outside of America.
This is a guaranteed way to get almost all non-whites to move out of America.