The shattered Poland that emerged from the rubble of World War II was reconstituted as a communist state and incorporated within the newly formed Soviet sphere of influence in Eastern Europe, despite the evident wishes of the overwhelming majority of the Polish nation. The deciding factor in this outcome was the dominant position gained by the victorious Red Army at the end of the war. At the conferences of Yalta and Potsdam in 1945, United States presidents and Britain's prime minister, Winston Churchill, met with Stalin to determine postwar political conditions, including the disposition of Polish territory occupied by the Red Army. At Yalta in February, Stalin pledged to permit free elections in Poland and the other Soviet-occupied countries of Eastern Europe. At Potsdam in July-August, the Allies awarded Poland over 100,000 square kilometers of German territory, west to the Oder and Neisse rivers, commonly called the Oder-Neisse Line (see fig. 11). In turn, about 3 million Poles were removed from former Polish territory awarded to the Soviet Union and resettled in the former German lands similarly about 2 million Germans had to move west of the new border.

The Yalta accords sanctioned the formation of a provisional Polish coalition government composed of communists and proponents of Western democracy. From its outset, the Yalta formula favored the communists, who enjoyed the advantages of Soviet support, superior morale, control over crucial ministries, and Moscow's determination to bring Eastern Europe securely under its thumb as a strategic asset in the emerging Cold War. The new regime in Warsaw subdued a guerrilla resistance in the countryside and gained political advantage by gradually whittling away the rights of their democratic foes. By 1946 the coalition regime held a carefully controlled national referendum that approved nationalization of the economy, land reform, and a unicameral rather than bicameral Sejm. Rightist parties had been outlawed by that time, and a progovernment Democratic Bloc formed in 1947 included the forerunner of the communist Polish United Workers' Party (Polska Zjednoczona Partia Robotnicza--PZPR) and its leftist allies.

The first parliamentary election, held in 1947, allowed only opposition candidates of the now-insignificant Polish Peasant Party, which was harassed into ineffectiveness. Under these conditions, the regime's candidates gained 417 of 434 seats in parliament, effectively ending the role of genuine opposition parties. Within the next two years, the communists ensured their ascendancy by restyling the PZPR as holders of a monopoly of power in the Polish People's Republic.

Data as of October 1992