Pearl Harbor Day
December 07 of each year is known as Pearl Harbor Day ever since the Empire of Japan attacked Pearl Harbor in the Territory of Hawaii at about 7:58 AM Local time on 07 December 1941. It is often called the Day of Infamy. This led to the United States being able to join into World War Two which ultimately led to the use of the atomic bomb on both Nagasaki and Hiroshima, Japan.
There has been, and still is, much debate on who was to blame for the attack.