The Civil War tends to bring out the worst in some of us.  We tell part of the story, but not the whole thing.  Southerners wanted to continue treating their slaves at levels less than they treated their cows and horses.  Opponents of slavery, including congressman A. Lincoln, advocated for the termination of slavery, reimbursement of loss to the slave owner, and return of the slaves to Africa.  In some cases the suggestion was made to send slaves to South America, Central America, and the Caribbean.  And, southern racists termed this phenomenon as "ethnic cleansing".  (Funny, southerners would hang their slaves who attempted freedom).