Would that be all citizens? Using Florida as an example if they seceded would all current Florida residents lose their US citizenship? What about people visit

Would that be all citizens? Using Florida as an example if they seceded would all current Florida residents lose their US citizenship? What about people visiting Florida - or those with multiple homes (snow birds etc...)? What if you personally object to the secession - would the US allow you to retain your citizenship and "immigrate" to Georgia? And, what if Florida refused to recognize a class of residents as new citizens? What would happen to all the federal prisoners located in Florida when secession happened - Florida probably doesn't want to adopt a large population of incarcerated Americans, they'd probably try to give them back to America somehow - ditto for incarcerated Floridians being held outside the state - though Florida might not want them back anyways. I think, at EOD, the US would probably offer continued US citizenship to any Florida residents who refused to accept Florida citizenship - which would likely result in Florida being a majority expat country, since, would you rather throw your personal future in with some new secessionist government or an established government that might end up eating Florida in a few weeks anyways?