You are joking right? Texan National Guard protecting ExxonMobile’s contracts in Qatar? And ATT left out of serving rest of the 49 States? It would be those corporations who move OUT of Texas.
Texas could ratify treaties closely aligning itself to United States in defense, much as we do with Canada. As far as watching corporations leave..... Watch what happens when we drop the corporate tax rate by half. They'll be flocking here.