OK, a one-way boat trip to Africa.
That solution was applied on a much smaller scale, with the founding of the nation of Liberia, in Africa. Freed slaves were sent back to Africa, on a volunteer basis, and they set up a government on the lines of the Constitutional Republic of The United States of America.
It sort of thrived for a few decades, then slid backwards into third world status, from which it has not emerged. Today it is pretty much a strongman dictatorship.
One of the dirtiest little secrets is that Africans despise black Americans. Even British and Brazilian blacks turn their noses up at blacks here in America.