Question

Help Fast! why did the US enter world war 2?

Answer 1

Well @ first the u.s were on no site, but then when the japanese bombed the american fleet in pearl harbor on Dec 7th. The us entered the war. 

Hope this helps!

Answer 2

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.