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The idea of freed african slaves in the US returning to settle in Africa was something that even Abraham Lincoln supported at one point. However it never became a very wide-spread idea and aside from Liberia and those who came to settle there, there was never any mass migration back.
Can anyone think of a scenario where migration back to africa would have become a more wide-spread phenomena in either the pre or post-civil war period? Perhaps some form of the "great migration" however to africa?