The South were the ones who made the Civil War about slavery within their secession statements.

"Treason in defense of slavery is not a subject matter appropriate for any freedom loving people to celebrate. The Civil War had good guys and it had bad guys. The good guys were the ones who won."

"To argue otherwise demonstrates a shocking lack of understanding over exactly how morally deficient any society is that treats human beings like livestock. Slavery is wrong, whether slavery is justified through racism or not. The end of slavery in America is not to be qualified by how long racism continued (continues) after slavery ended, because slavery in and of itself is an evil."