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.
Revolutions of 1989
In 1990, Jaruzelski resigned as Poland's president and was succeeded by Wałęsa, who won the 1990 presidential elections held in two rounds on 25 November and 9 December. Wałęsa's inauguration as president on 21 December 1990 is thought by many to be the formal end of the Communist People's Republic of Poland and the beginning of the modern Republic of Poland. The Warsaw Pact was dissolved on 1 July 1991. On 27 October 1991 the first entirely free Polish parliamentary elections since 1945 took place. This completed Poland's transition from Communist Party rule to a Western-style liberal democratic political system. The last Russian troops left Poland on 18 September 1993.