The Revolutions of 1989 begin: The Solidarity independent labor union reaches an agreement with the communist government of Poland to restore the bicameral legislature, which had been abolished after the communist takeover in 1946.
[added 1/21/2023]
Subsequent Events:
References:
Revolutions of 1989 Chronology | Indiana University Libraries
libraries.indiana.edu/revolutions-1989-chronology
History of Solidarity – Wikipedia
en.wikipedia.org/wiki/History_of_Solidarity#Second_Solidarity_(1988–1989)