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Yup.
Texas is mostly unified, and their Fed district is nearly entirely the one state.
Texas seceding from the U.S. entirely would not be surprising. And a lot sooner than 100 years from now.
California is not unified. And they are only one of 9 states in that Fed district.
I could see a handful of counties in SoCal (San Diego, Orange County, and some or all of the Inland Empire (Imperial, Riverside, San Bernardino) seceding from the State of California, but staying within the U.S. yet. But for 100 years from now though, a lot could change.