Source: Referendums Brazil has held three national referendums in its history. In the first, held on January 6, 1963, the people voted for the re-establishment of the presidential system of government (82% of valid ballots), which had been modified by a constitutional amendment in 1961. A second referendum, as ordered by the Federal Constitution of 1988, was held on April 21, 1993, when the voters voted for a republican form of government and reaffirmed the presidential system. A third national referendum, on the prohibition of the commerce of personal firearms and ammunition, was held on October 23, 2005. The ban proposal was rejected by 64% of the electorate. See also Electoral calendar Electoral system List of political parties in Brazil List of senators in Brazil Notes References External links Adam Carr's Election Archive Simulated voting machine (Portuguese) Courtesy of the Brazilian Superior Electoral Court website. (Java required) Brief history of electronic voting in Brazil Brazil: The Perfect Electoral Crime (II) (Security analysis of the Brazilian voting machines by James Burk, Oct. 21, 2006) Electoral Law of Brazil Inelegibility Law of Brazil Government of Brazil