The USS Arizona Memorial, located at Pearl Harbor in Honolulu, Hawaiʻi, marks the resting place of 1,102 of the 1,177 sailors killed on the USS Arizona during the Attack on Pearl Harbor on December 7, 1941 by Japanese imperial forces and commemorates the events of that day. The attack on Pearl Harbor and the island of Oʻahu was the action that led to United States involvement in World War II.
The United States has 100 protected areas known as national monuments. The President of the United States can establish a national monument by executive order, and the United States Congress can by legislation. The Antiquities Act of 1906 authorized the president to proclaim "historic landmarks, historic and prehistoric structures, and other objects of historic or scientific interest" as national monuments.