Cool. Next, let's shut off their water imports from Nevada and begin blockading the cities to starve them out.

California's geography is a natural deathtrap with many easily-blockaded chokepoints that limit effectively all overland travel into and out of San Diego and Los Angeles.

Kern County is based, and Palmdale and Victorville control the only two routes over the San Gabriels to the north of Los Angeles. The ascent up these routes is extremely vulnerable to attack and nobody would make them up intact. The El Cajon pass could be simply destroyed, the highway rendered impassable, and it would take years to rebuild.

El Centro is a great chokepoint but it's absolutely overflowing with fucking illegals. It also has a lot of crops. I would suggest entering to poison all the crops and then falling back outside the city along the I-8.

Palm Springs, Ventura, and Santa Clarita are the last major routes into Los Angeles. If you hold these points, you can starve LA.

San Francisco would be much harder to starve out due to its proximity to the Central Valley and strange geography. I would destroy the bridges, and use artillery stationed in Golden Gate Park to recreate Passchendale on downtown San Francisco. The communists will be forced to flee south, either along PCH (which you can turn into a killing field) or into San Jose. If you set up strongpoints on the 101 and consolidate everyone into San Jose, then the dark work begins.