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.
History of Poland (1989–present)
On August 19, President Jaruzelski asked journalist/Solidarity activist Tadeusz Mazowiecki to form a government; on September 12, the Sejm voted approval of Prime Minister Mazowiecki and his cabinet. For the first time in more than 40 years, Poland had a government led by non-communists.
In December 1989, the Sejm approved the government's reform program to transform the Polish economy rapidly from centrally planned to free-market, amended the constitution to eliminate references to the "leading role" of the Communist Party, and renamed the country the "Republic of Poland". The communist Polish United Workers' Party dissolved itself in January 1990, creating in its place a new party, Social Democracy of the Republic of Poland. Most of the property of the former Communist Party was turned over to the state.