Australian Federation By i will block you on roblox if u bully me 1901 Australia becomes a federation 1901 Australia's first Prime Minister - Edmund Barton voted into office 1901 5 out of 6 colonies vote yes to federation. April 1899 - September 1901 1901 Commonwealth of Australia Constitution Act is passed by British Government. July 1900. 1901 Henry Parkes makes speech in Tenterfield. 24 October 1889. 1901 Corowa Convention. 1893.