Not really sure but I doubt there would ever have been a move to repatriate the slaves to Africa on a national level. The economics of it alone would have been a really hard sell with a country in such shambles economically reeling from the civil wars costs.

My study shows John Wilkes Booth as simply a hard core southern sympathizer who held a deep seated hatred for the norths near total destruction of the south over the course of the war. This, coupled with his own opinion (and many others opinion, this author included) that the south had rightfully legally seceded from the union and that the US had unlawfully imposed their will militarily upon the confederacy for having done so left him filled with such an intense hatred after the south lost that he chose to eliminate the most stark figurehead of those actions, which of course was Lincoln