Gosh, I would've liked to have introduced Australia and Antarctica, but Aussie-tan still doesn't have a hint of a personality yet. =/ Maybe someday!

And no, Antarctica isn't technically a nation, yet. Everyone who lives in Antarctica is a citizen of an already established country, and Antarctica has no government or system of law. He's like America when the Europeans first found him: "what you get before you get countries," I think is how England put it.