Ten Allies of World War II:
- Canada (joined September 10, 1939)
- Tannu Tuva (June 25, 1941)
- Nicaragua (December 8, 1941)
- Ethiopia (December 14, 1942)
- Romania (August 23, 1944)
- Uruguay (February 15, 1945)
- Mongolian People's Republic (August 9, 1945)
- France (September 3, 1939)
- Belgium (May 10, 1940)
- Soviet Union (June 22, 1941)
I see that Mongolia joined the war effort six days before the war ended, perhaps coincidentally on the same day a nuclear bomb was dropped on Nagasaki. As for Tannu Tuva, it failed to survive the war; it was annexed by the Soviet Union in 1944. Still, nice to have them on board while they were around.
Incidentally, today is the sixty-fifth anniversary of Mexico becoming one of the Allied nations. Go Mexico!