I have absolutely zero issues with California leaving the union.
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California is truly a Communist state, run by communists, for communists.
If it were a foreign country with a formidable military force, we would attack and defeat it, and bring it under the rule of the US Constitution.
California is a hostile foreign country already.
Bear in mind though that over 3.5 MILLION Californians don't buy into the Manifesto. They voted for Donald Trump.