What attack led the U. S. to join World War II?

Bombing of Pearl Harbor

Explanation:

The Japanese attacked Pearl Harbor Dec. 7, 1941. Prior to that the US was "neutral" in the conflict abroad.

answer; i believe its a

(202 bc - 220 ad) dynasty started by lui bang; a great and long-lasting rule, it discarded the harsh policies of the qin dynasty and adopted confucian principles; han rulers chose officials who passed the civil service exams rather than birth; it was a time of prosperity