To-Whose wrote:
"California would take another Abe Lincoln.
Raise another Union Army and invade Sacramento to bring them back into the Union."
You posted that in half-jest (I presume), but -- that's what it's gonna take.
An army -- the United States army -- invading California, overthrowing the state government, and then establishing a new state government that, if it behaves, can then seek re-admission to the union...