Ok so what I think is that a civil war is inevitable due to the state of the union having issues that would eventually come up (Race mixing through slaves, slavery itself, social changes and having a fixed constitution thats hundreds of years old). The American government is not suppose to be a permanent thing and its going to collapse or reform dramatically. If a situation like that does occur I don't believe any "pacts" are going to help, because the governors of said states will change and nobody is loyal to their state anymore and haven't been since the civil war and even before that in the articles of confederation.
What's gonna happen is thousands if not tens of thousands of small cliques are going to continually fight for land until eventually some retard gets into one of the nuclear facilities in this country and blow the nation itself up (Again, we have nukes so a collapse in the system means those are free game to anyone with a gun and 10 friends).
Globally the world is gonna crash as well because the US not only provides defense for Europe but also economic support to most nations. Economies will collapse and virtually every nation will have political insurgency due to the diversity of every single countries politics with the influx of the "2nd enlightenment" of ideals.
What we see as a civil war won't have big sides of "the people who love the US government" vs "people that hate the US government" or "Liberal vs conservative" or any of that. It's gonna be me and my 30 guys vs you and your 30 guys for some piece of land so my clique can go from a 4 mile square to a 8 mile square.
I wish I could but Austin isn't worth fighting for. Gonna go rural and start a militia somewhere in a 2k population town.