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How many more "Czechoslovakias" are possible?
By that, I mean unprecedented unions of two countries, ideally with a hyphenated demonym ending with an o attached to a placename ("Czecho" + "Slovakia")
Especially during the collapse of an empire, especially if stewarded by a sort of "middle man" cultural group during the fall of that empire. (Such as Czechs in the Habsburg Empire, or Baltic Germans in the Russian Empire). But these two conditions are not absolutely required.
Some (perhaps not-so-realistic) examples to show what I mean:
Latvio-Lithuania
Bulgaro-Macedonia
Serbo-Croatia (now that one might actually happen)