Hopefully the Imperials* don't get up to their usual shenanigans anytime soon, and if they do I can tell you that we have the whole damned San Luis valley pre-registered. "The border was, is, and always shall be the Rio Grande!!!"
Please. Ever since Spain created the autonomous Empire of Mexico, it's been the site of much resent from everyone who's not a Peninsular or a Creole, even after its bonds with Spain withered away. They're in no state to conquer Texas.