Treaty on the Final Settlement with Respect to Germany

The Treaty on the Final Settlement with Respect to Germany (German: Vertrag über die abschließende Regelung in Bezug auf Deutschland), more commonly referred to as the Two Plus Four Agreement (Zwei-plus-Vier-Vertrag), is an international agreement that allowed the reunification of Germany in October 1990. It was negotiated in 1990 between the 'two', the Federal Republic of Germany and the German Democratic Republic, in addition to the Four Powers which had occupied Germany at the end of World War II in Europe: France, the Soviet Union, the United Kingdom, and the United States.

Source: Wikipedia — Treaty on the Final Settlement with Respect to Germany (CC BY-SA 4.0)