Secession is essentially available without any of the present parts of the government (the States and Federal) having anything to do with it other than support it. How does this work? A Private Membership Association. A PMA supports the government, because it is the government that authorizes it to exist, over and over, with something like 70 major Supreme Court decisions, and the 1st, 4th, and 9th Amendments - and more. --- What if your PMA owned one big ranch on both sides of the Mexican/U.S. border. Mexicans join your PMA. They are welcome on any part of your PMA ranch.