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 Second Polish Republic
Administrative division of the Second Polish Republic became an issue immediately after Poland regained independence in the aftermath of the First World War, 1918. Poland had been partitioned in the late 18th century, and various parts of new Polish territory had belonged to different administrative structures of Austrian Empire, Imperial Germany and Russian Empire.