From 1989 through 1991, Poland engaged in a democratic transition which put an end to the Polish People's Republic and led to the foundation of a democratic government, known as the Third Polish Republic (Polish: III Rzeczpospolita Polska), following the First and Second Polish Republic. After ten years of democratic consolidation, Poland joined NATO in 1999 and the European Union on 1 May 2004.
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The Constitution of the Republic of Poland (Polish: Konstytucja Rzeczypospolitej Polskiej or Konstytucja RP for short) is the supreme law of the Republic of Poland, which is also commonly called the Third Polish Republic (Polish: III Rzeczpospolita or III RP for short) in contrast with the preceding systems.
The current constitution was ratified on 2 April 1997. The Constitution is also commonly referred to as the 1997 Constitution. It replaced the Small Constitution of 1992, a revision of the 1952 Constitution of the Polish People's Republic. It was adopted by the National Assembly of Poland on 2 April 1997, approved by a national referendum on 25 May 1997, promulgated by the President of the Republic on 16 July 1997, and came into force on 17 October 1997.