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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.
What else can I help you with?
Which two groups fought civil war in china both before and after world war 2?
none
What other groups were targered during World War 2?
All who opposed the Nazis and their allies.
What were the groups in World War 2?
The groups were the allied and the axis. The allied mainly being America,Russia, Britain. The axis being Germany,Italy ,and Japan.
Did Erwin Rommel become famous before World War 2 or after World War 2?
After World War 2
Which world war did WE lose the most men world war 1 or 2?
world war 2
What groups did Hitler round up in world war 2?
Jews
Who was the terrorist groups in World War 1 and what did they believe?
There were no terrorist groups in World War I.
What were the names of the groups of volunteer women in world war 2?
bobby joe but
What were the two groups that represented china after World War 2?
Communists and Nationalists
What were the 2 groups fighting together at world war 1?
Briton and USA
What were some of the different ethnic groups during world war 2?
gypys
What groups of people were evacuated to the countryside in world war 2?
British children
Did underground resistance groups help the Nazis?
In the context of World War 2 resistance groups resisted the Nazis.
Which two groups fought civil war in china both before and after world war 2?
none
Which groups did World War 2 create better opportunities for?
African Americans and women
What were the special fighting groups in World War 2?
British colonist french and irocoise
What groups had new opportunities during world war 2 in America?
america and germany
