Secession Is a Solution for Deep Political Division

States, like abusive partners, tend to resort to physical violence to prevent any separations they don't approve of, (cf. U.S. Civil War 1861-5, Biafra 1967-70, Ireland, 1916, Chechnya,1995-6 & 1999-2000, Kurdistan, 1990-ongoing). And even if the over-state agrees to some sort of referendum on succession (c.f. , Quebec 1995, Scotland 2014, "Brexit" referendum, 2016), legal flim-flammery and other okey-dokey often belie the promises made. The only true independence comes either from an armed uprising, (Ireland, 1916), or if the over-state just bails (East Germany, 1989). Only exception I can think of is the Mormom migration away from Illinois to  the Salt Lake Valley, 1844-1850. Although SLV was claimed by the U.S. gov, the Republic of Mexico, and by native aboriginal people, none were willing or able to excercise state-level violence to oppose their migration, and so the Mormons were sucessfully able to have an independent community for a few decades.