Pearl Harbor is a U.S. naval base located on the island of Oahu, Hawaii. It is famously known for the surprise attack by the Japanese Imperial Navy on December 7, 1941, which led to the United States' entry into World War II. The attack resulted in significant damage to the U.S. Pacific Fleet, including the sinking of battleships like the USS Arizona. The event is commemorated annually and serves as a reminder of the impact of war on nations and their people. The Pearl Harbor National Memorial now stands to honor those who lost their lives during the attack and to educate future generations about this pivotal moment in history.