Secretary of State Dean Acheson is shown signing Tripartite Security Treaty (ANZUS). Left to right, behind Acheson are: unidentified, Sen. Edwin C. Johnson, John Foster Dulles, Sen. Alexander Wiley, unidentified. Back row, Sen. H. Alexander Smith, Sen. John Sparkman, unidentified. The ANZUS treaty (a defense treaty signed by Australia, New Zealand and the United States) was created from discussions that occurred between 1949 and culminating in the signing of the treaty on September 1, 1951, at San Francisco, California. (See also 96-1185.)