History of Poland
The Polish People's Republic ("Polska Rzeczpospolita Ludowa") was established under the rule of the communist Polish United Workers' Party (PZPR). The name change from the Polish Republic was not officially adopted, however, until the proclamation of the Constitution of the Polish People's Republic in 1952.
Polish People's Republic
The Polish People's Republic was divided into several voivodeships (the Polish unit of administrative division). After World War II, the new administrative divisions were based on the pre-war ones. The areas in the East that were not annexed by the Soviet Union had their borders left almost unchanged. Newly acquired territories in the west and north were organised into the voivodeships of Szczecin, Wrocław, Olsztyn and partially joined to Gdańsk, Katowice and Poznań voivodeships. Two cities were granted voivodeship status: Warsaw and Łódź.
In 1950 new voivodeships were created: Koszalin - previously part of Szczecin, Opole - previously part of Katowice, and Zielona Góra - previously part of Poznań, Wrocław and Szczecin voivodeships. In addition, three other cities were granted the voivodeship status: Wrocław, Kraków and Poznań.