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Poland is located on the Baltic Sea and is the largest state (population in 2023: 37,636,508, area: 313,964 km²) in East Central Europe. The name of the state is derived from the West Slavic Polans, who brought more and more territories under their rule from the 9th century onwards, which were known as Duchy of Poland in the 10th century. Under Mieszko (ca. 960-992), the extent of the country reached approximately its current borders. He was at times subject to tribute to the German Emperor, at least for parts of his land. Poland probably adopted Christianity in 966 and from 1025 it was a kingdom. Between 1138 and 1295, the country was fragmented as a result of inheritance disputes. The extinction of the ruling Piast dynasty led to a Polish-Hungarian personal union in 1370, which was replaced by a Polish-Lithuanian dual monarchy as early as 1386 due to pressure from the Polish nobility. The growing role of the nobility resulted in an elective monarchy in 1572. However, the disunity of the nobility led to the three partitions of Poland (1772-1795) between Prussia, Russia and the Habsburg Monarchy. Poland only became independent after the end of the First World War in 1918 and lost its independence in 1939 after the German attack from the west at the beginning of the Second World War and the Russian invasion from the east. From 1945-1989 it was a satellite state of the Soviet Union. Poland has been a member of the European Union since 2004.

Czechoslovakia was a state existing between 1918 and 1992 with changing borders and under changing names and political systems, the former parts of which were absorbed into the present-day states of the Czech Republic, Slovakia and Ukraine (Carpathian Ukraine, already occupied by Hungary in 1939, from 1945 to the Soviet Union). After 1945, Czechoslovakia was under the political influence of the Soviet Union, was part of the so-called Eastern Bloc as a satellite state, and from 1955 was a member of the Warsaw Pact. Between 1960 and 1990, the communist country's official name was Czechoslovak Socialist Republic (abbreviated ČSSR). The democratic political change was initiated in 1989 with the Velvet Revolution and resulted in the establishment of the independent Czech and Slovak republics in 1992.

The Soviet Union (SU or USSR) was a state in Eastern Europe, Central and Northern Asia that existed from 1922 to 1991. It emerged from the so-called Soviet Russia, the successor state of the Russian Empire. The Russian Soviet Republic formed the core of the union and at the same time its largest part, with further constituent republics added. Their number varied over time and was related to the occupation of other countries (Estonia, Latvia, Lithuania), Soviet republics that existed only for a short time (Karelo-Finlandia) or the division or merger of Soviet republics. In addition, there were numerous autonomous republics or other territorial units with an autonomy status that was essentially limited to linguistic autonomy for minorities.

Before its formal dissolution, the USSR consisted of 15 Soviet republics with a population of approximately 290 million people. At around 22.4 million km², it was the largest territorial state in the world at the time. The Soviet Union was a socialist soviet republic with a one-party system and an absence of separation of powers.

Yugoslavia was a southeastern European state that existed, with interruptions and in slightly changing borders, from 1918 to 1992 and 2003, respectively. The capital and largest city of the country was Belgrade. Historically, a distinction is made in particular between the period of the Kingdom of Yugoslavia from 1918 to 1941 (also called 'First Yugoslavia') and communist Yugoslavia from 1945 (the so-called 'Second Yugoslavia') under the dictatorial ruling head of state Josip Broz Tito (1892-1980). The disintegration of Yugoslavia from 1991 and the independence aspirations of several parts of the country eventually led to the Yugoslav Wars (also called the Balkan Wars or post-Yugoslav Wars). Today, the successor states of Yugoslavia are Slovenia, Croatia, Serbia, Montenegro, North Macedonia, Kosovo and Bosnia and Herzegovina.