Medved is hooked on hearing his own voice most of all as is the case with most moralists. It needs to be asked what is it he actually wishes to conserve. My guess is that what he would say is quite shocking. Besides this conservative hasn't a clue about the history of California besides what he has read from his leftist friends.
Any quick check history for dummies would show Mexico City claimed certain territories, today's Southwest, but never was able to govern them. The wild Indians (comaches,apaches) held sway there until AMERICANS moved in en masse with the US Army Calvary.