Come on, T'Girl.
No, I was serious. I could easily see the Federation only contacting the "major players" on any given planet. Perhaps only the technological and economic superpowers. On Earth today, depending on your definition of "a country," there are approximately two hundred countries, So while there might be some kind of courtesy call or polite chit-chat at a diplomatic conference, I really don't see the Contact Team interacting with every single country on a equal footing.