Grant owned slaves?? Where are the references for that one?
Go to Google and search for "grant owned slaves". It's never been a secret.
Grant was one of 12 U.S. presidents who owned slaves at some point in their lives. His wife inherited some from his father in law but Grant himself bought at least one more in 1858 when he was working as a farmer near St. Louis. His wife had 4 slaves. Although it is unclear who actually held title to them, Grant and his wife certainly had the use of them. These slaves were not freed until the ratification of the 13th amendment.
Also cited here > http://home.nas.com/lopresti/ps.htm