That would be a hostile act of war. Why would we want to do that? I want CA to succeed in seceding. Not fight them. I want them gone. How can I help make #CALEXIT a reality?
Well, they would be another country, correct with their own interests. Why would we give without getting something in return? I am okay with feeding water to CA but for a price.
The silly environmental policies over the years have left CA vulnerable and not self-sufficient — power production, water, etc.
The risk here is that CA might develop alliance's with China or Mexico. Although I doubt that Mexico has much to offer other than impoverished citizens. But this would be a “put your money where your mouth is” moment for CA.
China on the other hand....
And there is the risk that other states might follow.