What happened to most of the countries of Eastern Europe at the end of world war 2?

At the end of World War II, most Eastern European countries fell under Soviet influence as the Red Army occupied the region. This led to the establishment of communist governments aligned with the USSR, effectively turning these nations into satellite states. Countries such as Poland, Hungary, Czechoslovakia, and East Germany experienced significant political and social upheaval as they transitioned to communist rule, which lasted for several decades until the fall of communism in the late 1980s.