December 7 is a significant date in history, most notably remembered for the attack on Pearl Harbor in 1941. This surprise military strike by the Imperial Japanese Navy led to the United States' entry into World War II. The attack resulted in substantial damage to the U.S. Pacific Fleet and the loss of many lives. In the United States, December 7 is observed as a day of remembrance. Each year, ceremonies are held to honor the service members who lost their lives during the attack. The date serves as a reminder of the impact of war and the importance of peace.