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the US joined WWII because of the attack on pearl harbor which took place 7th of December, 1941, the US joined quickly after that
America joined WW2 shortly after the Pearl Harbor bombing. Japan and the US were on hot ground, fighting over oil pipes in Japan.
In December 1941, after the Japanese attacked Pearl Harbor resulting in the loss of several ships and the deaths of 2,000 sailors, despite the fact the nations were not at war with each other. Japan was anticipating war with the US, especially after the Americans stopped supplying oil and moved their Pacific fleet to Hawaii.

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7y ago
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12y ago

The US declared war on Japan (unanimously in the Senate, and 388 to 1 in the House of Representatives) on 8 December 1941 thus entering WWII. The declaration was in response to the bombing of Pearl Harbor on 7 December 1941.

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Q: When and why did the US enter World War 2?
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Was it vital for the US to enter in World war 2?

yes it was vital 4 the US 2 enter World War 2 because we needed their help 2 win the war. It turns out tht because of them we won the war.


When did the US enter world war 1 and 2?

1941


What did the us enter after world war 2?

pearl harbor


Did the US enter World War 2 on D-Day?

No


What year did the US enter to world war 2?

1941


Why did us enter the Great War 2 and a half years after the war was started?

World War 2


What prompts the US to enter World War 2?

Pearl Harbor


When did US enter in World War 2?

08 Dec 1941


What year did the US enter Wolrd War 2?

1909 to 1944 The US entered World War 2 in December of 1941.


In what year did the US declare war and enter world war 2?

on decmber 8 1941


What country was primarily responsible for causing the US to enter the war?

World War 2 : Japan.


Why did the US enter the World War 2?

Japan attacked the US Fleet at Pearl Harbor.