The Stasi headquarters in Berlin were occupied on 15 January 1990.[6] 13 January 1990 - The dissolution of the Stasi.[7] 18 March 1990 - The 1990 East German general election, which was also a quasi-referendum on reunification, in which the Alliance for Germany, which supported reunification, got the highest proportion of votes.[8] 1 July 1990 - The Währungs-, Wirtschafts- und Sozialunion (Monetary, Economy and Social Union) accord between East and West Germany, came into effect.[9] East Germany adopted the West German currency on this day.[9] 31 August 1990 - The signing of the Einigungsvertrag (Treaty of Unification) between the GDR and the Federal Republic of Germany on 31 August 1990 and the Treaty on the Final Settlement with Respect to Germany on 12 September 1990.[9] 3 October 1990 - German reunification achieved with the five re-established East German states integrated into the Federal Republic of Germany.[1]