Give up, grant them independence, recognize Kommiefornia as a sovereign nation, revoke the American citizenship of every resident of the state, then divert the Colorado river and see to it that nary a drop of its water ever leaves the boundaries of the 47 contiguous United States.
Then listen to them howl.
Arizona needs to be walled off from the rest of the USA, they need to also have all their water drained and taken away, that whole state is full of leftists, look at how many of them voted for Biden in 2020