Question

why did USA get involved in second world war

Answer 1

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.
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Answer 2

US INVOLVED IN SECOND WORLD WAR BECAUSE AT OTHER END JAPAN IS CONQUERING ALL THE EASTERN ASIA SO US AFRAID OF IT SO IT CAME IN THE FORCE IN ALLIED POWERS