Question

how did the USA join in the second world war? how did the war come to an end?

Answer 1

First Germany attacks in USA so USA join the second world war. Then it end when USA attack nuclear bomb in Hiroshima and Nagasaki.
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Answer 2

Although the war began with Nazi Germany's attack on Poland in September 1939, the United States didnot enter the war until after the Japanese bombed the American fleet in Pearl Harbor, Hawaii, on December 7, 1941.

The war ended with the Axis powers' unconditional surrender in 1945.