Plus, the cultural, historic, linguistic similarities between Alamaba and Woyming are infinitely greater than between the UK and Croatia. A person visiting Alabama from Texas isn't a "stranger", and wouldn't be treated or considered as one.
Move a city boy from New Jersey to Alaska or deep Lousiana and see how much of a stranger he ends up being, even if the language is technically the same.
Google "Westphalian Sovereignty" and go from there.
Is Scotland a country? Is Wales?
One can make arguments like "why would some folks in England, for instance, decide for people living in Scotland, or Northern Ireland?" but where do you draw the line? Wales has less autonomy than Scotland but is still a "country" on Wikipedia, are they oppressed? Inverness has social policy dictated from the Lowlands, is it not a true democracy then? `davidw in the next comment thread over isn't too happy with the amount of power Wyoming has over California, can it work in the long run? Or is it only EU federation that HN will complain about?
I'll just keep on turning it around - why would some folks in New York, for instance, decide for people living in Alabama, or Wyoming?