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The United States of America joined in the World War II after 7th of December, 1941; the day on which it's Pearl Harbor was attacked. Prior to this America had stayed away from the war and wasn't a part of either the Allied or the Axis powers. However, when Japan destroyed almost the entire American navy with a surprise bombing of Pearl Harbor which was of its primary naval bases, the U.S joined in fighting along side France and Britain.

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13y ago
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10y ago

Germany declared war on the US on 11 December 1941

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13y ago

1917 ww1

1941 ww2

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Q: The US entered the war in what year?
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Related questions

What year did the US entered world war 1?

1917 smart


What was the year the US entered world war 2?

1941


What was the year that russia withdrew from world war 1 the same year the US entered war?

1917.


What are the causes of the US entry into Wolrd War 1?

Un-restricted submarine warfare. If it wasn't for that, the US would not have entered the war. As it was, the US was only in it for a year anyway...it ended in 1918 (the US entered the war in 1917).


What year did the us and Canada become allies with World War 2?

As soon as the US entered the war in December 1941


What was the month and year the US entered World War 1?

April 1917


What year did the US enter Wolrd War 2?

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


What date US entered World War 1?

The US entered the war on April 6,1917


When did the US go to War World 1?

The US entered World War 1 on April 6, 1917. It remained in the war until it ended about a year and a half later.


Why did the allies embark on the war in 1917?

The allies entered the war in 1914; the US entered the war in 1917.


For a year after the US entered the war German U-boats successfully operated throughout?

the Atlantic Ocean.


What was the longest war the US has ever entered?

The longest war the United States ever entered was the Vietnam War.