High Quality Content by WIKIPEDIA articles! The referendum of 27 May 1967 approved two amendments to the Australian constitution relating to Indigenous Australians. Technically it was a vote on the Constitution Alteration (Aboriginal People) 1967, which became law on 10 August 1967 following the results of the referendum. The amendments were overwhelmingly endorsed, winning 90.77 percent of votes cast and carrying in all six states. The other question put in the referendum, on the composition of parliament, was rejected, receiving less than half as much support.