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.
Administrative division of the Polish People's Republic
Administrative division of Polish People's Republic was subject to several reforms. The first of those established administrative division over the Polish territories that had shifted significantly westwardly. The Polish People's Republic administrative division was reformed in: 1946, 1950, 1957 and 1975. The 1975 division survived the fall of communism in 1990 and was replaced only in 1999 by the most current administrative division of Poland, which closely resembles the 1945-75 scheme but with different names (the Communists tended to simply name the voivodeships after their capitals, whereas the current ones use more historical names) and changes in the borders in certain areas.