A good way to get the answer is to into a POV at that time. What are they fighting for? What beliefs do they believe in because of the war. The big one is Slavery. Big in the south, Abraham Lincoln was trying to make slavery illegal. Another was States Rights, that states can make their own state laws. Ex: In Arizona it's illegal to cut down a cactus. And Abraham Lincoln himself, the people in the south didn't like that he wanted to end slavery. So there was a war brewing between the north, and the south.
