I think the word you’re looking for is “secession,” not “succession.” : )
It was just last month that a county commissioner from Riverside or something proposed creating a State of Southern California from Orange, San Diego, Imperial, Riverside and San Bernadino Counties. As you may remember, I would prefer splitting CA into 5 states, 2 of them heavily Democrat (one comprising LA County, and the other running from the Bay Area to Monterey County) and 3 GOP-leaning states of about 11 EVs each (one in Orange, San Diego and Imperial Counties, another in the Inland Empire and Ventura, and a third in the Central Valley all the way north to the Oregon border). If the Valley succeeds in seceding from LA County, it can join the Inland Empire GOP-leaning state.
I've probably typed "succession" by mistake at least half of the times I meant to type "secession". ;d