The Territory of Hawaii or Hawaii Territory was an organized incorporated territory of the United States that existed from April 30, 1900, until August 21, 1959, when most of its territory was admitted to the United States as the 50th US state, the State of Hawaii. The Hawaii Admission Act specified that the State of Hawaii would not include Palmyra Island, the Midway Islands, Kingman Reef, Johnston Atoll and Sand Island.