The U.S. was responsible because you think the Declaration of Independence OK'd it and Lincoln somehow tricked them into starting the war. I find it very amusing that you don't think the South bears any responsibility for anything that happened to them.
I have said countless times that they never should have attacked Ft. Sumpter, but the Northern response was as if the Wife slaps a man, and he breaks her face, and then holds her down and makes her lick crap up off the floor.
Yes, the wife shouldn't have slapped the Husband, but the Husband absolutely shouldn't have beaten the wife nearly to death.