First, of course I'm okay with teaching children that black people sold other black people, including children into slavery.You're the one who doesn't want children to be taught history, remember?
As for your civil war argument, are you saying that the noble white Northerners fought the deplorable white Southerners on behalf of poor enslaved blacks? I'm also okay with teaching all white children this.
Yes if I force Americans, even ones that tend to agree with conservatives to repudiate the legacy and culture of deplorable white Southern Confederates, I do indeed win.
Most people do understand that the Nazis were deplorable but for some reason when it comes to slaving Confederates and slaving Founders a lot of Southerners don't make that same connection. It's important to remind them just as it's important to remind people of the Nazis.
Some Southern states still celebrate Confederates day, doesn't seem they got the memo about those deplorable American Nazis. How would you feel if entire States decided to celebrate Hitler day as they just did Robert E Lee and Jefferson Davis day?
And you're an easily debated mental midget.