No one is 100% free of bias. I think secession was a mistake, and that slavery is wrong (just as most of our founders did). However, I tire of the revisionist PC blather that "North Good, South Bad." It's just not an accurate historical perspective on the Civil War. Americans fought that war with each other - with good men on both sides and some bad men on both sides.
Finally something we can agree on. I was beginning to think that Abraham Lincoln was the only bad man on either side.