Fine. Let them go.
However, they do not get to dictate terms. We do.
They can have the “blue” counties and cities, but we keep all the “red” counties and “red” areas that are presently within “blue” counties. We also keep northern California — the state of Jefferson. We keep the Navy bases in San Diego and the Marine bases inland, as well as Edwards Air Force base, and any and all other presently existing military bases. We sell the “blue” areas water, but on our terms and at our prices. They can take it or leave it.
We cut off all federal (USA) payments to these “blue” areas. None of our tax dollars will go to anything in the seceded areas.
Great!! Good riddance to the socialist craps. The red areas can leave the blue cesspool and become the 50th state again.