The US entered World War 1 on April 6, 1917. The war ended about one and a half years later.
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the catylist that caused America to enter world war two was the bombing of pearl harbour.
because japan attacked America causing America to enter world war 2 and i caused a global war because America created the first nuke
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
because we thought that if it did not involve us it was none of our business
The U.S. wanted to remain neutral before World War 2. But after the attack by the Japanese on Pearl Harbor, America was not hesitant when entering the war.