They can move, but the land stays.
Brilliant has the best reply. I recall, from a while back an army general being asked by a group of Texans whether they could secede.
HIs response was (to paraphrase) that such a question had already been settled.
From sea to sea the U.S. is our land. If you don’t like it then leave. It would be good for California as the housing crisis should resolve itself then.
Perhaps governor moonbeam should be first.