what was the last state to come into the united states?
exists and is an alternate of . Hawaii was the last state to join the United States of America. It became a state on August 21st, 1959. It was the 50th and last state to become a part of the U.S. Hawaii was the last state to join the United States of America. It became a state on August 21st, 1959.<br />It was the 50th and last state to become a part of the U.S.