Why did the world face growing social unrest in the 1960s?

In the 1950s and 1960s the United States and the Soviet Union, as well as both western and eastern Europe, rebounded economically from the combined strains of the Great Depression and the Second World War. The post war return of prosperity increased living standards and expanded education, health, and leisure opportunities for many. But these decades of economic growth did not resolve underlying tensions and conflicts. In the Soviet Union and eastern Europe reforms could not undo the harsh dictatorial grip of the socialist system and Communist parties. In western Europe a process of political and economic integration softened but could not fully offset the loss of overseas empires and the damage inflicted by war. In the United States, while an economic boom broadened the middle class, millions confronted racism and segregation, and growing popular opposition to Cold War military interventions such as the war in Vietnam increasingly dominated national politics.