Question

when did United States join the Second World War ​

Answer 1

Answer:

December 7, 1941

Although the war began with Nazi Germany's attack on Poland in September 1939, the United States did not enter the war until after the Japanese bombed the American fleet in Pearl Harbor, Hawaii, on December 7, 1941.

Answer 2

Answer:

in December 7 1941 the us enter in second world war

Explanation:

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