The civil war had nothing to do with the 2nd ammendment. States rights are as much a part of the constitution as gun rights. Besides, if half the states ban guns and the other half doesn't, who's going to win the next civil war if there is one?
I’ll explain it in another way. You or your state does not have any “right” to infringe on my God given Rights.
It was decided in 1865 that no one had the “right” to enslave another human being.
Anyone’s God given Freedom trumps a state’s “right” to enslave.