Well, that and the confederates were democrats who liked slavery.

Obviously not all of course. A large majority of the confederate soldiers were poor farmers with no slaves at all but that also begs the question of why they bothered to defend slavery if they didn't need slavery in the first place.

By all means, the southern economy was ruined after the war and those who had slaves suffered enormous losses but things hadn't changed all that much for the average poor confederate.