A bit of history. After Mexico’s independence in 1822, the honchos of the Territory of California constantly argues, even to the point of armed encounters, to split between the north with a capitol of Monte Rey and the south at Los Angeles. Later, Sonoma was talked of as the capitol of the north. It was the Americans who came along and set the state lines in the 1840s and made Sacramento the capitol.
More about this particular attempt @ Splitting California Into 3 Pieces Is Long Overdue