UPTDATE UPDATE UPDATE
In the comment section of this post, you can find Corey Meyer's perfect illustration of the evilize-white-southerners mindset, which proves without a doubt that it's not history with him, it's about stirring up hate for white Southerners.
He totally defineS them by slavery and slave ownership. These weren't people with families and homes they loved, they weren't people with a religious faith, they weren't farmers, workers, merchants or anything else. They had no human characteristics beyond slave owning (which most of them did not do) and fighting for slavery (which most of them did not do).
It's another example of focusing on one small aspect and trying to palm it off as the whole. When you're that willingly blind, when you are that willing to assassinate your own intellect for the sake of demonizing others, your "history" is just so much sewage.