Was the civil of the usa was it fought to set the slaves free and if u fought in died in it would u have gone?

That's one of the reasons, but not the only one. But I'm not so sure God would judge based on whether or not the person was freeing slaves. Seems to me, God didn't mind people owning other people. Even had laws about How to go about owning other people and what to do when they misbehave.