Joe Biden wants South Carolina to remove the Confederate flag from the Statehouse grounds. He thinks it's classy to demand this sort of thing on MLK Day, I guess. Northerners refuse to learn the meaning of the flag, the reasons for secession, or anything other than the history that gets put into textbooks. It's sad, because there's a lot to learn. And a lot that was gained. The South made huge headways for states' rights.
Yes, Lincoln "freed the slaves" during the war. Why is that in quotes? Mostly because he only freed those slaves in the states that had seceded. They weren't following his edicts, anyway, and those states not in rebellion were unaffected. The reasoning for the Emancipation Proclamation hinged far more on preventing European support for the South. It was a smart move, but hardly the same move the textbooks relate to our schoolchildren.
The agricultural South was being dominated in national politics by the industrial North. Tariffs, import/export laws, and taxes were being unfairly levied against the South's economy. The Southern states decided to use their perceived right to peacefully secede, which the North denied.
Would we have slaves today if not for the Civil War? No. Slavery was already doomed by advances that were making that much labor not only unnecessary, but also uselessly expensive. Also, the political pressures and Underground Railroad (which helped gain ground for abolitionist sentiment) were marking the death knells for the institution of slavery.
Was the War of Northern Aggression a bloody and dark war? Yes. Should we try to erase it? No.
By the way, I have not provided nearly enough of a history lesson for you here. Please do your own research. I'm tired and Northern.