The civil war wasn't about SLAVERY, it was about SECESSION. Before the war, America was a union of sovereign states. They joined and left by their own will, and the federal government existed for their benefit. After the war, the states existed for the federal government's benefit, and they had no power other than what the fed gave them. Slave importation was already declared illegal in the south before the north won. Lincoln's emancipation proclamation only freed southern slaves to prevent them from joining their owners to fight the northern invaders. Slavery remained legal and practiced in the north until the 13th amendment. Slavery was just the blanked vilification that the winners applied to the losers, just as unfair taxation without representation would have been the blanket vilification applied to the north if the south had won. Slavery was a nationwide issue and the civil war, while speeding up the process, was not fought for the purpose of ending slavery. It was fought for the same reason America's revolutionary war was fought. There was no "good side" or "bad side", there were just Americans that wanted independence, and Americans that wanted mandatory national unity.