A recent poll in California showed that 30% supported the idea of secession.
You mentioned that “if 51% vote to secede then bye bye.”
What happens when all or a portion of the 49% on the other side contest the vote with firearms? A war within the borders of the state in question.
IF the entire state secedes then they are a separate country. They can handle any internal strife anyway they want to. My guess there wouldn’t be any. Not my problem.