I'm currently using 'it' when referring to USA but I use 'они' (they) in Russian when doing the same. After all, I think it's more correct to use 'they' since they are United States.
I've got confused about that only recently.
So when I say USA do I use 'it' (since I am referring to a single country) or they (because there are many states in USA)?
Also, do I say "USA does smth." or "USA do smth."?