At that point we will have a Civil War. There are far too many assets within the southwest that are owned by U.S. citizens and foreign interests. Federal troops within the reconquista state will obey the President, not the Governor. It will be state police, state gang bangers, Mexican Troops, La Raza guerrillas and possibly a few national guard against a well funded U.S. military. Will be over in days.
Yes, but the rounding up and summary execution of all Marxist agitators, Mecha rabble-rousing racists, and other traitors will last a while longer.