The German Democratic Party was a liberal political party in the Weimar Republic, considered centrist or centre-left. It was formed in 1918 from the Progressive People's Party and the liberal wing of the National Liberal Party, both of which had been active in the German Empire. In July 1930, the DDP united with the People's National Reich Association (VNR) to form the German State Party (DStP). The self-dissolution of the DStP, forced by the Nazis, took place on 28 June 1933.