[Anitius Severinus Boethius]

Ok, I will explain this as simply as I can.

The Organization of American States is an organization that the U.S.A. has diplomatic ties to.

The North Atlantic Treaty Organization is an organization that the U.S.A. has diplomatic ties to.

The U.S.A. is not a nation that the U.S.A. has diplomatic ties to.

Thus:

The State Department has a page for the OAS, a page for NATO, but no page for the U.S.A.

[jedward]

Ok, I understand. Thank you.

[colorado tanker]

It's even more obvious in Britain where they have a Foreign Ministry and Home Ministry.

Thanks for posting, now I don't have to try to explain this.