Which Eastern European nation was the first to reject Communism between 1989 and 1991?

Poland was the first Eastern European nation to reject Communist rule during the 1989–1991 wave of change. In 1989, the Solidarity movement won a major victory in partially free elections, leading to a non-Communist-led government. Bulgaria, Albania, and Hungary also moved away from Communism, but Poland was first among these choices.

AI-written and checked against the verified answer.