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Japan's attack on the US Fleet at Pearl Harbor left them with little room to turn the other cheek. Already indirectly aiding Britain desite the fears of isolationists, the US soon committed to defeating both Germany and Japan.

The Americans were forced to join WWII because the Japanese Navy and Air Forces bombed Pearl Harbor on Sunday, Dec 7, 1941. On Monday, Dec 8, 1941, America declared war on Japan. Three days later Germany declared war on the USA.
The attack on Pearl Harbor on December 7, 1941. Congress declared war on Japan December 8, 1941.
2 events caused the USA to enter WW2. 1 was the surprise attack of Japan on Pearl Harbor on December 7th, 1941. The other was the declaration of war on the USA by Germany.

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8y ago
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9y ago

The US entered WW2 because Japan attacked Pearl Harbor

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Q: Why did the US enter World War 2?
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Related questions

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


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

No


What did the us enter after world war 2?

pearl harbor


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.