The Paris Peace Treaties were signed on 10 February 1947 following the end of World War II in 1945. The Paris Peace Conference lasted from 29 July until 15 October 1946. The victorious wartime Allied powers negotiated the details of peace treaties with those former Axis allies, namely Italy, Romania, Hungary, Bulgaria, and Finland, which had switched sides and declared war on Germany during the war. They were allowed to fully resume their responsibilities as sovereign states in international affairs and to qualify for membership in the United Nations. Nevertheless, the Paris Peace Treaties avoided taking into consideration the consequences of the Molotov–Ribbentrop Pact, officially known as the Treaty of Non-Aggression between Germany and the Union of Soviet Socialist Republics, whose secret clauses included the division of Poland between Nazi Germany and the Soviet Union, the occupation of the Baltic States, and the annexation of parts of Finland and Romania. The Molotov–Ribbentrop Pact changed the borders agreed after the Paris Peace Conference (1919–1920), and was signed on August 23, 1939. One week later, World War II started with Nazi Germany's invasion of Poland, followed three weeks later by the Soviet invasion of Poland, which was completely erased from the map. In the following years, Nazi Germany and the Soviet Union changed the borders established by the peace treaties at the end of World War I.

The Second Hungarian Republic was a parliamentary republic briefly established after the disestablishment of the Kingdom of Hungary on 1 February 1946 and was itself dissolved on 20 August 1949. It was succeeded by the Soviet-backed Hungarian People's Republic.