Indochina was still another Cold War battlefield. France had controlled Vietnam since the middle of the 19th century, only to be supplanted by Japan during the Second World War. Meanwhile, Ho Chi Minh, a Vietnamese communist, sought to liberate his nation from colonial rule and took the American War for Independence as his model. After the Allies defeated the Japanese in 1945, they still had to deal with Ho Chi Minh.  

France, hoping to regain great-power status, insisted on returning to Vietnam. Ho refused to back down, and the war for liberation continued. The United States, eager to maintain French support for the policy of containment in Europe, provided France with economic aid that freed resources for the struggle in Vietnam. Even that assistance could not prevent French defeat in 1954. At an international conference in Geneva, Vietnam was divided, with Ho in power in the North and Ngo Dinh Diem, a Roman Catholic anti-communist in a largely Buddhist population, heading the government in the South. Elections were to be held two years later to unify the country.  

Persuaded that the fall of Vietnam could lead to the fall of Burma, Thailand and Indonesia, Eisenhower backed Diem's refusal to hold elections in 1956 and began to increase economic and military aid. Kennedy increased assistance, and sent small numbers of military advisors, but still the struggle between North and South continued. Diem's unpopularity culminated in his overthrow and death in 1963.  

The situation was more unstable than ever before. Guerrillas in the South, known as Viet Cong, challenged the South Vietnamese government, sometimes covertly, sometimes through the National Liberation Front, their political arm. Aided by North Vietnam, they gained ground, especially among the peasants in the countryside. Determined to halt communist advances in South Vietnam, Johnson made the Vietnam War his own. After a North Vietnamese naval attack on two American destroyers, Johnson won from Congress on August 7, 1964, passage of the Gulf of Tonkin Resolution, which allowed the president to "take all necessary measures to repel any armed attack against the forces of the United States and to prevent further aggression." After his re-election in November 1964, he embarked on a policy of escalation. From 25,000 troops at the start of 1965, the number of soldiers -- both volunteers and draftees -- rose to 500,000 by 1968. A massive bombing campaign wrought havoc in both North and South Vietnam.  

With grisly battles shown on television, Americans began to protest their country's involvement in the war. Such foreign policy specialists as George Kennan found fault with U.S. policies. Others argued that the U.S had no strategy for ending the war. Americans watched as the massive military campaign seemed to have no effect on the course of the war. Public dissatisfaction with U.S. policy, especially among the young, pressured Johnson to begin negotiating for peace.  

Anti-war sentiment in 1968 led Johnson to renounce any intention of seeking another term. At the Democratic National Convention in Chicago, Illinois, protesters fought street battles with police. The chaos in the Democratic Party, especially after the murder of Robert Kennedy in June; white opposition to the civil rights measures of the 1960s; and the third-party candidacy of Alabama Governor George Wallace (who won his home state, Mississippi, Arkansas, Louisiana and Georgia) helped elect Republican Richard Nixon, who ran on a plan to extricate the United States from the war and to increase "law and order" at home.  

While slowly withdrawing American troops, Nixon ordered some of the most fearful bombing in the war. He also invaded Cambodia in 1970 to cut off North Vietnamese supply lines, which passed through there to South Vietnam. This led to another round of protests and demonstrations, as students in many universities took to the streets. In one such demonstration, at Kent State in Ohio, national guard troops who had been called in to restore order panicked and killed four students.  

A cease-fire, negotiated for the United States by Nixon's national security adviser, Henry Kissinger, was finally signed in 1973. Although American troops departed, the war lingered on into the spring of 1975, when North Vietnam consolidated its control over the entire country.  

The war had a tremendous price. It left Vietnam devastated, with millions maimed or killed. The United States spent over $150 thousand-million in a losing effort that cost 58,000 American lives. The war also ended the Cold War foreign policy consensus. The public found that certain American military units had engaged in atrocities in Vietnam and that the government had lied about the circumstances surrounding the Gulf of Tonkin incident in 1964. Many Americans were horrified at the invasion of Cambodia. The war led many young Americans to question the actions of their own nation and the values it sought to uphold.