Another factor.. The cities, once cut off from supplies, will destroy themselves from inside as the liberal underclass mobs start rioting. They have been bred and raised for one purpose, to vote democrat in elections. They have no other use, not even as canon fodder.
Wrong—The new People’s Republic of California would quickly become an iron Communist state—looters shot, firm laws, prisons armed and conscripted into the People’s Revolutionary Army. Guns banned, food rationed, Internet down and controlled. The State needs things—they would take them. A wall would be built by California at the border-TO KEEP PEOPLE FROM ESCAPING TO MEXICO!
The liberal’s would be heavily armed and well financed.
Which would also destroy the economy in the “red” areas.
Historically, when this happens (China, Spain, etc), the rural areas often win. However, it is at such a cost that “winning” often means “breaking everything”.