> The United Kingdom, which unlike the United States is quite literally comprised of different countries
"State" is the usual legal term for sovereign juridical entities with territory, while "country" is a less formal term that often corresponds to a state.
(And the "countries" that make up the UK aren't sovereign even in theory, though
some of them have some degree of home rule granted by the central sovereign.)
> the USA is not in some crazy unique position
Unique? No.
But common? Also no.
And it structurally does make solving some problems quite hard, and it makes changing the structure to resolve those problems also hard.
Australia also has a similar setup to the USA, and has also managed to solve this problem.
I don’t know the inner workings of every country, but I assume there are more in the same position.
I’m sorry, but the USA is not in some crazy unique position that no other country has ever faced before. You just choose believe this inaccuracy.