@cicerone imposter,
Yes, there have been north and south CA separation questions, and for some years now a secession effort in the high north of the state. No link, but I've read about it off and on for years.
From early on in my long time in California, I was well aware of snappish takes by northern californians, which I as a southern one could see their points about, even decades ago. And, natch, vice versa.
Whatever (I say keep it together myself, but I would, even though I've lived south and north) - in any case, it's not about secession from the US.
This brings up a book I'm reading that is set in California... by Wallace Stegner. It was a little hard to figure the organization of the book at first, but now I'm into it:
All The Little Live Things. I've hardly started and I know I have to read more of him. He was very knowledgeable about the land and it shows in some of his simple descriptions that 'knock me out'.
https://en.wikipedia.org/wiki/Wallace_Stegner
Gee, even the list of his students is something...