Why did the United States enter World War II?

Question

Why did the United States enter World War II?

A. It did not agree with British politics.
B. It wanted land in Europe.
C. It was attacked by Japan.
D. It wanted the economic opportunities that war could bring.

Answer 1

The United States entered World War II because it was attacked by Japan. On December 7, 1941, Japan launched a surprise attack on the U.S. naval base at Pearl Harbor, Hawaii, which led to the U.S. declaring war on Japan the following day.