Question: what caused the united states to enter world war ii quizlet?
Answer: Why did the U.S. enter World War II? The U.S. entered WWII because the Japanese bombed U.S. battleships and airplanes at Pearl Harbor, Hawaii. The U.S. declared war on the Axis powers on December 7, 1941. ... For starters, they were the first African American pilots to fight on behalf of United States during the war.