The American "Civil War" was not about slavery -- even Lincoln himself said that in documented correspondence. The Civil War was about preserving the Union. It was not the "war of Northern aggression," but the war of FEDERAL aggression. It was a test of which was greater, the individual states, or the union into which they had entered. The union won, and that's where we are at today.
I've been wondering lately if that is where the EU is -- at the point of crisis that will determine which is greater, the individual "states" that make up the EU, or the EU itself. So far, Merkel (and Germany) is holding the EU hostage with their big bucks. Maybe the EU could easily survive a Greek "secession", but what if Spain or Italy were to falter? (It really is inevitable at this point.)
So, what would it take for the EU to take sides and start fighting? Are we close to that point? How would the EU split? I personally get the feeling that Merkel has well alienated herself and Germany.