What changes happened in most eastern europe countries at the end of the cold war?

At the end of the Cold War, most Eastern European countries experienced significant political and economic transformations, marked by the collapse of communist regimes. This shift led to the establishment of democratic governments and the transition towards market economies, often accompanied by social upheaval and reform movements. Countries like Poland, Hungary, and Czechoslovakia saw peaceful revolutions, while others, such as Romania, experienced violent upheaval. The dissolution of the Soviet Union in 1991 further accelerated these changes, allowing many nations to pursue closer ties with Western Europe and NATO.