A possible scenario in the not too distant future.....?
Things really go to hell in a handbasket down south. The drug/border war spills into Texas in a big, big bloody way. US.gov opts (for change) to sit on its hands and issue some sternly worded statements to Mexico thinking that will make the evil go away. Texas mobilizes the Nat'l guard to man the borders and makes plans to start its OWN border construction to stem the tide of drugs and violence. US.gov tells Texas, "Don't even try it." The people of Texas tell US.gov to do something obscene with itself, sideways. A movement within the state to secede (again) begins to gain momentum. Again, US.gov tells Texas, "We really mean it. Don't even think about it, because if you do...NO SOUP (money) FOR YOU!" Texas starts legal procedures to declare its independence, anyway.
In a surprise move, troops in Mexican uniforms and armor under the control of 1 or more of the cartels stream into Texas to "reclaim" their land "stolen" from them just a little more than a century ago. The Mexican gov't claims they're not responsible for the unfortunate incursion and that it's really the work of the Cartel(s) that they cannot themselves control.
Texas becomes the new "Front Line of Freedom" as tens of thousands of Modern Minute Men head for Texas to push Mexico back to their original border in house to house clashes.
US.gov simultaneously declares Martial Law in all states bordering Texas in an attempt to prevent armed patriot citizens and any kind of goods/aid from entering Texas. US.gov however then realizes it is not yet ready for a full country-wide lockdown; (which is what would be needed) as the number of those willing to aid Texas by any/all means necessary are much greater and more resolute than anticipated.
US.gov not wanting to create a further international scene offers to lift martial law if Texas agrees to submit their complaints to a disinterested neutral third party in hope of amicably resolving the differences between themselves and Texas, and Texas and Mexico. In return, US.gov will try to broker a "peace deal" between Texas and Mexico. It won't however, consider providing military support to thwart ongoing Mexican aggression as Mexico and La Raza really might have a point about "stolen" land. And, as we all know territorial conquest matters are best resolved by...wait for it...the U.N. (Just ask Israel about the bang-up job the U.N. does to stop Palestinian rocket launches from the Gaza Strip.)
Possible?
Night Wolf will now barf up the Sun Maiden
2 hours ago