Mongolia, finally announced its support for the Allies on August 9, 1945. This was after the use of atomic weapons in Japan. There were many neutral nations that joined the Allies as the war was coming to a close. For a complete list of participants see; http://en.wikipedia.org/wiki/Participants_in_World_War_II
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Japan.
the catylist that caused America to enter world war two was the bombing of pearl harbour.
Depending on who you are you fought in World War 2. World War
Alliances was signed and if one alli declares war first than the other country goes into war.
World War 2