I'm very aware of the reasons the North actually went to war. It was, incidentally, that southern stubbornness that lost the South the war since France would have almost certainly come in on their side (and from the Northern front where Grant couldn't have hoped to deal with them) had Robert E. Lee been half as smart as Lincoln and simply claimed they wanted to be a separate country.

But you can't ignore the slavery though. Without it, there would have been no wealth in the south worth going to war for (nor enough resources to support succession).