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.
List of heads of state of Poland
The People's Republic of Poland was founded under Soviet protection on 31 December 1944 and recognized by the United States and the United Kingdom since 6 July 1945.