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The Allies (USA, Canada, Britain, Soviet Union etc.) agreed to pool their resources and fight the Axis powers as a joint operation. Because of the greater industrial output of the USA and the increased manpower, the Allies were able to make inroads towards defeating the enemy which hadn't been possible before.

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14y ago
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12y ago

Japan bombing Pearl Harbor on December 7, 1941.
The Japanese attack on Pearl Harbor, December 7,1941 was the immediate cause of the United States entering WWII. The US declared war on Japan after the attack, and two days later Germany declared war on the US and we were in it.

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13y ago

December 7, 1941: The bombing of Pearl Harbor.

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7y ago

the bombing of Pearl Harbor

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11y ago

the japans attack on pearl harbor

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10y ago

Pearl Harbor

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12y ago

Attack on Pearl Harbor

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12y ago

Into Europe

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Q: What event prompted the United States to enter world war 2?
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