The problem is once this evil part of our history is erased, what will they have to bitch about?
Why YOU of course. Anyone who objects to the "progressive" agenda is now and forever more a "Nazi," a "Klansman," and must be eliminated with violence if necessary. And that means YOU.
Furthermore, it was powerful tribes in Africa that sold their own countrymen into slavery. In America, one of the most notorious slave owners was a black feller. Brutal guy. His name was Anthony Johnson. William Ellison was another along with his relatives.
Abe Lincoln bantered about the idea while in the Senate of colonizing blacks back to Africa/Caribbean, feeling they'd have a difficult time assimilating into the American society.
Indians held slaves as well. Raiding parties would kill the men and take the babies/woman as slaves.
A myth that many parrot...the Civil War was over slavery. False! There was indeed an issue with slavery, but not the primary reason for the war. Another myth. Slave owners were brutal toward blacks. Yes, there was horrible brutality, but there were many slave owners that were good, decent folks in need of the labor to operate agriculture industries.
In fact, after the war, many blacks did not want to leave their homes on the plantations. This is where they worked, raised their families, taught the children. There also were blacks who fought freely for the South.
Revisionism has perverted many a fact in America.