Happy Day of German Unity! Today marks the 26th anniversary of the unification of East and West Germany. Although the fall of the Berlin Wall on November 9, 1989 symbolically united East and West Germany, the Treaty of Unification, signed by both states in August 1990, became effective on October 3, 1990. Tag der Deutschen Einheit, or the Day of German Unity, is a national holiday in Germany with official celebrations in a different city each year. This year, the celebrations take place in Dresden.