Which treaty, signed in 1990, settled the external aspects of German reunification after the Wall fell?

The Two Plus Four Agreement settled the external aspects of German reunification after the Berlin Wall fell.

Its formal title was the Treaty on the Final Settlement with Respect to Germany. The “two” were East and West Germany; the “four” were the United States, the Soviet Union, the United Kingdom and France, the four powers that still held postwar rights and responsibilities concerning Germany and Berlin.

The treaty was signed in Moscow on 12 September 1990, shortly before reunification on 3 October. It confirmed that the united German state would consist of West Germany, East Germany and Berlin, and it ended the remaining Allied legal restrictions on German sovereignty. Germany also accepted its existing borders, including the border with Poland.

It is often confused with the Maastricht Treaty, which created the European Union framework, or the Treaty of Versailles, which followed World War I. The Two Plus Four Agreement was specifically about Germany’s international status, borders, military arrangements and full sovereignty after reunification.