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Original Answer: mostly Americans and Nazis,

Updated: The Americans joined the war on December 8th, 1941 (Pearl Harbour)not gettng to Europe until January 1942. The war commenced 1 September 1939 - 2 September 1945 so American troops joined half way through. They had been providing economic support prior to this though (although this arguably could have been taking advantage of the situation as some consider WWII is what made America the economic pwer it has been in recent times).

Most of Europe (not the Swiss), Asia and Australasia were involved in WWII. African nations participated also - but I am not sure if there were any exclusions. Most of the world participated.

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Q: In World War 2 what 2 groups were there?
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