The Polish People's Republic was a country in Central Europe that existed from 1947 to 1989 as the predecessor of the modern-day Republic of Poland. From 1947 to 1952 it was known as the Republic of Poland, and it was also often simply known as Poland. With a population of approximately 37.9 million near the end of its existence, it was the second most-populous communist and Eastern Bloc country in Europe. A unitary state with a Marxist–Leninist government, it was also one of the main signatories of the Warsaw Pact alliance. The largest city and official capital since 1947 was Warsaw, followed by the industrial city of Łódź and cultural city of Kraków. The country was bordered by the Baltic Sea to the north, the Soviet Union to the east, Czechoslovakia to the south, and East Germany to the west.
Poland's fate was heavily discussed at the Yalta Conference in February 1945. Joseph Stalin, whose Red Army occupied the entire country, presented several alternatives which granted Poland industrialized territories in the west whilst the Red Army simultaneously permanently annexed Polish territories in the east, resulting in Poland losing over 20% of its pre-war borders. Stalin then imposed upon Poland a puppet communist government following the war, forcibly bringing the nation into the