Question

The United States became officially involved in World War II when A. Congress declared war on Japan. B. Germany declared war on France. C. Congress declared war on Germany. D. Germany declared war on Great Britain.

Answer 1

well the Japanese bombed Pearl Harbor, Hawaii, on December 7, 1941. So The United States  had to join the war.

Answer 2

A. Congress declared war on Japan.

This is because Japan attacked Pearl Harbor.