Fall of France
The best example would be Switzerland, because it was neutral and not allied to any other nation, and therefore not influenced by other nations. I don't think that the United States was controlled by any other nation, or that the USSR was controlled by any other nation, or that Nazi Germany was controlled by any other nation, however, they did have alliances which influenced them.
Great Britian
Russia did.
I think Germany was the last nation to surrender to Allied Forces in 1918.
Germany
Germany. The allies controlled West Germany. Russia controlled East Germany until the Berlin Wall was torn down.
Germany
It wasn’t a nation but a city and that was Berlin, Germany. That created two separate Germany’s one called East Germany controlled by Russia and west Germany controlled by the western nations.
Germany.
Germany
Germany with about 83,000,000