The 1950s marked a pivotal shift in Soviet and Eastern European history. Stalin's death in 1953 ushered in new leadership under Khrushchev, who introduced de-Stalinization and economic reforms. These changes rippled through the Soviet Union and its satellite states. Despite some liberalization, the Soviet Union maintained tight control over Eastern Europe. The period saw key events like the Hungarian Revolution and the launch of Sputnik, while Cold War tensions escalated through the arms and space races.