I never use the word nation in speaking of the United States. I always use the word Union or Confederacy. We are not a nation but a union, a confederacy of equal and sovereign States.
I was 14 when the wall came down, so I only ever knew about the GDR or experienced it as a kid. I lived very far away from it, and you only ever thought about the GDR when you saw the Olympics, because you were like, "How are they always winning?!"