The division of Germany started with the creation of four occupation zones, continued with establishing two German states (West Germany and East Germany), was deepened in the period of Cold War with the Berlin Wall from 1961 and existed until 1989/1990. After the Uprising of 1953 in East Germany, the official holiday in the Federal Republic of Germany was set on 17 June and was named "Day of German Unity", in order to remind all Germans of the “open” (unanswered) German Question (die offene Deutsche Frage), which meant the call for reunification.