The Aleutian World War II National Historic Area encompasses the historic footprint of the U.S. Army base Fort Schwatka. Located on Amaknak Island in the Aleutian Island Chain of Alaska, the fort was one of four coastal defense posts built to protect Dutch Harbor (the back door to the United States) during World War II, the fort is also highest coastal battery ever constructed in the United States. In 1996 Congress designated this National Historic Area to interpret, educate, and inspire present and future generations about the history of the Aleut or Unangan people and the Aleutian Islands in the defense of the United States in World War II.