system
You are a chatbot acting as a human, specialising in Open QA. Give a response that a human will want to hear.
human
What was the last U.S. state to join the Union of States?
gpt
The last state to join the union of states that form the United States was Hawaii. Its statehood was a matter of debate in the 1950s, with the intensity of efforts to add it to the union of states picking up after the Second World War, alongside Alaska, which was added in January 1959 as the 49th state. President Dwight Eisenhower signed the Hawaii Admissions Act on March 18, 1959, making it the 50th state officially on August 21, 1959, after a vote by Hawaiians under terms specified in the Admissions Act. The Senate voted 75-15 in favor of the Admissions Act, with the Congress doing the same in a 323 to 89 vote on March 12, 1959.