Most of the shipping on routes that go through California are to or from California destinations. The Mexican truckers aren't necessarily interested in going to Canada.

The point is that there is already an existing international treaty that a separate California could join into, that already MANDATES that the rest of the US MUST PERMIT traffic from member nations.

I'll agree that the water supply is a major obstacle to survival of California as a separate country; but there also are existing international agreements there as well. It's just that nobody can agree on what the agreements are, so only the lawyers get rich over them.

John