Escape from L.A. (1996)
A sequel to 1981’s Escape from New York, Escape from L.A. predicted that an earthquake would break Los Angeles off the rest of California and become an island by 2013. In the John Carpenter-directed film, the president of America turned the newly formed island into a dumping ground for people who don’t conform to his hyper-conservative views.
Thankfully, California hasn’t had the “Big One” yet. But when it does, it’s very unlikely that it will become a prison island under the control of a theocrat president.