Brazillian coup d'etat By happyhippos88 Aug 25, 1961 Janio Quadros resigned and Joao Goulart became president. Dec 30, 1962 The Plano Trienal was anounced. Jan 6, 1963 Joao Goulart re-established the presidential system. Mar 31, 1964 The Brazillian coup d'etat The Brazillian coup d'etat took place against the President of Brazil. Period: Mar 31, 1964 to Mar 15, 1985 Military dictatorship in Brazil as a result of the coup d'etat Jan 15, 1985 The election of Tancredo Neves ends the military dictatorship.