> I don't think unions are reversible at this state in history. The national state is not exactly living a revival.
Unions not reversible? Ask Yugoslavia, Czechoslovakia, or the USSR. Or within Europe currently, the Scottish and Basque separatist movements. The growth of the EU -- largely for financial reasons (access to EU development aid and a large market) -- has been an exception in an era of fragmentation.
Well, the soviet republics you mentioned weren't really unions but Stalin's grand vision how the world is supposed to be organized.
After WW2, commies divided the land under their control into countries and forcibly relocated people around to match new borders in pursuit of "historic justice" and whatnot.
Unions not reversible? Ask Yugoslavia, Czechoslovakia, or the USSR. Or within Europe currently, the Scottish and Basque separatist movements. The growth of the EU -- largely for financial reasons (access to EU development aid and a large market) -- has been an exception in an era of fragmentation.