You're preaching to the choir on that one.

True, and to a similar degree, we commonly call it the "Civil War" however that term implies 2 bodies fighting for control of a single state.

The US South wanted to break away, there was no "civil war" 

freetx

There's also an interesting interpretation that I think the founders would have been split on. Because it says "levying against them", a secessionist group would not be treasonous if the only war they were willing to fight was a defensive one.