That's really interesting - I sometimes wonder what would have happened if there had only been a partial success in the War of Independence and the States had gone their own ways - maybe a western union all down the coast with parts of Canada and Mexico joined in?
No, it would just be CA. Over the last decade or two, California has come to realize that it is different than the rest of America. Californians are more liberal, both socially and politically, more tolerant, and welcoming of foreigners and foreign ideas. The recent election has put those differences with the rest of America into stark contrast. That is the very short version of the Calexit reasoning. Oh, I am originally from California!