Question

why did usa came 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 the Japanese bombed theAmerican fleet in Pearl Harbor, Hawaii, on December 7, 1941. ... The war ended with the Axis powers' unconditional surrender in 1945

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Answer 2

Japan attacked U.S. bases at Pearl Harbour and unwillingly USA was made to fall in the war to take the revenge.