Let's take the power away from DC and its one stop lobbyist shopping mall. The local mayor would have more power than the POTUS. Give the central gov't what the Constitution mandated to them and nothing more. Their "small Navy" can be the Coast Guard. Our miiltary would go back to being state or local militias. That way, if the blue states didn't want to contribute to the war in Iraq, they'd simply not fund it. Let Texas fund it.
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In this distributed world you describe in which, as you write, Texas (perhaps in cooperation with other *red* states) funds and supports military aggression, what would prevent those regions of the decentralized, former United States that retained the F-22s, the M1s, the MIRV warheaded missiles and all the rest of the heavy killing gear from simply blasting our happily intentional communities to dust if it suit their purposes?
Or, less dramatically, what would prevent them from using the hard fact of their considerable destructive power to apply relentless pressure on their essentially defenseless (*defenseless*, because local militias and Coast Guard size navies are no match for fuel air bombs and aircraft carriers) neighbors?
If everyone doesn't play nice, things could get very harsh. Everyone rarely plays nice.
.d.