The Revolutions of 1989, also known as the Fall of Communism, was a revolutionary wave of liberal democracy movements that resulted in the collapse of most Marxist–Leninist governments in the Eastern Bloc and other parts of the world. Sometimes this revolutionary wave is also called the Fall of Nations or the Autumn of Nations, a play on the term Spring of Nations that is sometimes used to describe the Revolutions of 1848 in Europe. It also led to the eventual dissolution of the Soviet Union—the world's largest communist state—and the abandonment of communist regimes in many parts of the world, some of which were violently overthrown. The events, especially the fall of the Soviet Union, drastically altered the world's balance of power, marking the end of the Cold War and the beginning of the post-Cold War era.
The earliest recorded protests began in Kazakhstan, then part of the Soviet Union, in 1986 with student demonstrations, and the last chapter of the revolutions ended in 1996 when Ukraine abolished the Soviet political system of government, adopting a new constitution which replaced the Soviet-era constitution. The main region of these revolutions was Central Europe, starting in Poland with the Polish workers' mass-strike movement in 1988, and the revolutionary trend continued in Hungary, East Germany, Bulgaria, Czechoslovakia, and Romania. On 4 June 1989, Poland's Solidarity trade union won an overwhelming victory in partially free elections, leading to the peaceful fall of communism in Poland. Also in June 1989, Hungary began dismantling its section of the physical Iron Curtain, while the opening of a border gate between Austria and Hungary in August 1989 set in motion a peaceful chain reaction, in which the Eastern Bloc disintegrated. This led to mass demonstrations in cities of East Germany such as Leipzig and subsequently to the fall of the Berlin Wall in November 1989, which served as the symbolic gateway to German reunification in 1990.