The Admission Act, formally An Act to Provide for the Admission of the State of Hawaii into the Union is a statute enacted by the United States Congress and signed into law by President Dwight D. Eisenhower which dissolved the Territory of Hawaii and established the State of Hawaii as the 50th state to be admitted into the Union. Statehood became effective on August 21, 1959. Hawaii remains the most recent state to join the United States.