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The United States involved herself in World War II when Japan attacked Pearl Harbor in December 1942 (correct me if I'm wrong on the date) Germany and her allies, allied with Japan declared war on the United States and therefore Congress declared war on them.
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Related questions
When did the US become invloved with World War 1?
The US got involved in the war on: April 6, 1917.
How did the us become invloved in World War 2?
They became involved when the Japanese bombed Pearl Harbor
What did the US become after world war 1?
world powers
What did the US become after the War?
It had evolved into a World Power.
Why did the US become envolved in World War 2?
The US was attacked.
After world war 1 did the US become a world power?
yes
Why did the us become involed in world war 1?
how did we get involved
What caused the US to have world power after World War 1?
The US and the Allies won the war and the US gained control of the Philippines, causing it to become a world power.
Would World War I have been in the US?
No, it was a European war we chose to become involved in.
Which conflict did the US become involved in shortly after World War 2?
korean war
Which world war general went on to become a US president?
Eisenhower
Which conflict did the US become involved in shortly often world war 2?
The Korean War ,
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