Question

why did USA enter into the Second World War

Answer 1

Although the war began with nazi Germany's attack on Poland in September 1939, the united states did not enter the war until after Japanese bombed the American fleet in pearl harbor, Hawaii,on December 7,1941
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Answer 2

Answer:

Japan was expanding its power in the east and had captured French Indo-China and was planning to attack on US naval bases in the Pacific. When Japan attacked the US base at Pearl Harbor, the US entered the second World War.