The entry of the United States into World War II cured the depression: millions of men and women joined the armed forces and others went to work in defence jobs causing millions more Americans to move to the Atlantic, Pacific, and Gulf coasts and see place otherwise they could not know.
When World War II ended, the United States was in better economic condition than any other country in the world.
Public policy, like the so-called GI Bill of Rights passed in 1944, provided money for veterans to attend college, to purchase homes, and to buy farms.
Unfortunately groups as African Americans, Hispano Americans, and American women were still excluded from the American Dream and became more aggressive in trying to win their full freedoms and civil rights as guaranteed by the Declaration of Independence and US Constitution during the post-war era.
The post-war world also presented Americans with a number of problems and issues.
By 1948, a new form of international tension had emerged–Cold War–between the United States and its allies and the Soviet Union and its allies, a war that lasted almost 20 years.
After the United States intervened militarily in Vietnam in the mid-1960s a strident debate among American about the Vietnam War started.
The end of the Vietnam War helped to end debates about that war.
The Iran Hostage Crisis and the failure of the Presidency of Jimmy Carter helped Americans to realize the dangers of the Islamic world and the how dependent they had become on foreign oil.
During Ronald Reagan’s presidency the Cold War saw its end
George Bush moved a war to helped to liberate the nation of Kuwait from the Iraqi aggression in 1990-1991.
President Clinton was the promoter of a successful economy.
As the 21st century was born, the United States came to realize that battling Islamic terrorism, at home and abroad, was their newest raison d’être.