The United States dominated global affairs in the years immediately after World War II. Victorious in that great struggle, its homeland undamaged from the ravages of war, the nation was confident of its mission at home and abroad. U.S. leaders wanted to maintain the democratic structure they had defended at tremendous cost and to share the benefits of prosperity as widely as possible. For them, as for publisher Henry Luce of Time magazine, this was the "American Century."
For 20 years, most Americans remained sure of this confident approach. They accepted the need for a strong stance against the Soviet Union in the Cold War that unfolded after 1945. They endorsed the growth of government authority and accepted the outlines of the welfare state, first formulated during the New Deal. They enjoyed the postwar prosperity that created new levels of affluence in the United States.
But gradually some Americans began to question dominant assumptions about American life. Challenges on a variety of fronts shattered the consensus. In the 1950s, African Americans launched a crusade, joined later by other minority groups and women, for a larger share of the American dream. In the 1960s, politically active students protested the nation's role abroad, particularly in the corrosive war in Vietnam, and a youth counterculture challenged the status quo of American values. Americans from many walks of life sought to establish a new equilibrium in the United States.
Source: U.S. Department of State