The Vietnam War, 1945-1975

By the end of this lesson, students will be able to:

• Trace the Vietnam War from the postwar French Indochina conflict and the 1954 Geneva Accords through the Eisenhower and Kennedy escalations, the Gulf of Tonkin Resolution of August 1964, the bombing campaigns and ground buildup of 1965 to 1968, the Tet Offensive, Vietnamization, and the fall of Saigon in April 1975.
• Explain how the domino theory and the policy of containment carried American commitments from Truman's underwriting of the French effort through Lyndon Johnson's full-scale ground war.
• Analyze the Tet Offensive of January 1968 as a battlefield setback for North Vietnam that became a political turning point in American public opinion and ended the Johnson presidency.
• Account for the rise of the antiwar movement on American college campuses, the Kent State and Jackson State killings of May 1970, and the broader credibility crisis that produced the Pentagon Papers and the War Powers Resolution of 1973.
• Use Skill 5 (Causation) to identify the most important short-term and long-term causes of American defeat in Vietnam and the Vietnam Syndrome that constrained later interventions.

The American war in Vietnam is best understood as four overlapping wars stacked on the same ground. The first was a colonial war: the French effort, from 1945 through 1954, to reclaim Indochina from the Viet Minh independence movement led by Ho Chi Minh. The Truman and Eisenhower administrations bankrolled roughly four-fifths of the French war effort by 1954, viewing French success as a Cold War necessity even as French armies bogged down in the rice paddies of the Tonkin delta. After the French garrison at Dien Bien Phu fell in May 1954, the Geneva Accords of July 1954 partitioned Vietnam at the seventeenth parallel, with Ho Chi Minh's communist Democratic Republic of Vietnam in the North and a non-communist State of Vietnam in the South under the Catholic nationalist Ngo Dinh Diem. The accords called for nationwide reunification elections in 1956 that the United States and Diem refused to hold (KC-8.1.I.D.ii).

The second war was the American war of advisers, 1954 through 1964. Eisenhower articulated the domino theory at a 1954 press conference, arguing that the loss of Indochina would topple Burma, Thailand, and Malaya in turn, and committed the first American advisers to train the Army of the Republic of Vietnam. John F. Kennedy, who took office in 1961, raised the adviser presence from roughly 700 to more than 16,000 by November 1963. The Diem government in Saigon was authoritarian, narrowly Catholic, and increasingly resistant to American direction; in November 1963, after a wave of Buddhist self-immolations and crackdowns provoked international outrage, the Kennedy administration acquiesced in a military coup whose generals murdered Diem on November 2, 1963. Three weeks later Kennedy himself was assassinated. The two killings handed his successor an inherited war whose strategic premises no civilian had recently audited.

The third war was the American ground and air war, 1964 through 1973. Lyndon Johnson, after reports of two attacks by North Vietnamese patrol boats on the destroyer USS Maddox in the Gulf of Tonkin in early August 1964, asked Congress for a resolution authorizing the president to repel armed attacks against United States forces and to assist any Southeast Asian state requesting help. The Gulf of Tonkin Resolution passed on August 7, 1964 with only two senators in opposition; the House voted unanimously. The text became the legal foundation for everything that followed, even though a 1968 Senate inquiry and the later release of the Pentagon Papers established that the second of the two reported attacks almost certainly never occurred (KC-8.1.II.C.ii). In March 1965, after Viet Cong attacks on American installations in the South, Johnson authorized Operation Rolling Thunder, a sustained bombing campaign against North Vietnam that ran from 1965 through 1968 and dropped more tonnage than the United States had used in the entire Pacific war. American ground troop numbers rose from roughly 184,000 at the end of 1965 to a peak of about 540,000 in 1969 (KC-8.1.I.D.ii).

The Tet Offensive of late January 1968 marked the political turning point. On the Vietnamese lunar new year, the People's Army of Vietnam and the National Liberation Front launched coordinated assaults on more than one hundred cities and military installations across South Vietnam, including a sapper team that breached the perimeter of the United States embassy compound in Saigon. American and South Vietnamese forces inflicted heavy casualties on the attackers and recovered every position within weeks, so as a battlefield event Tet was a defeat for the North. Politically, however, the offensive shattered the administration's narrative that the enemy was nearly broken. Walter Cronkite, returning from Saigon at the end of February, told a national audience that the war had reached a stalemate. On March 31, 1968, Johnson announced a partial bombing halt, the opening of peace talks in Paris, and his decision not to seek reelection. Tet did not end the war, but it ended the political consensus that had made escalation possible.

The fourth war was the war of Vietnamization, 1969 through 1973, under Richard Nixon. Nixon and his national security adviser Henry Kissinger pursued a strategy of gradual American troop withdrawal combined with a transfer of combat responsibility to the Army of the Republic of Vietnam and continued heavy United States air support. The strategy was paired with widening, not narrowing, the war geographically. American forces conducted a secret bombing campaign against North Vietnamese supply routes through neutral Cambodia beginning in March 1969; in April 1970 Nixon ordered a ground incursion into Cambodia that touched off the largest wave of American campus protest of the entire war (KC-8.1.II.C.ii). Four students were killed by Ohio National Guard fire at Kent State on May 4, 1970; ten days later, on May 14, Mississippi state police killed two students at Jackson State. American operations expanded into Laos in February 1971. American troop levels fell from roughly 540,000 in 1969 to fewer than 30,000 by 1972 even as the bombing intensified. The Paris Peace Accords of January 27, 1973 formally ended direct American combat. North Vietnamese forces overran the South within two years; Saigon fell on April 30, 1975, the last American helicopters lifting from the embassy roof as North Vietnamese tanks broke through the gates of the Independence Palace.

The human accounting was severe. The war killed roughly 58,000 American service members and wounded more than 300,000. Vietnamese losses were far greater: approximately 1.1 million combatants and more than 2 million civilians on both sides of the partition. Cambodia and Laos absorbed extensive bombing whose unexploded ordnance still kills civilians today. The political reckoning at home produced the War Powers Resolution of November 1973, passed over Nixon's veto, requiring the president to report any deployment of forces into hostilities within forty-eight hours and to withdraw within sixty days absent a congressional authorization. The release of the Pentagon Papers by Daniel Ellsberg in June 1971, and the Supreme Court decision in New York Times v. United States later that month, deepened public mistrust of executive secrecy and established a strong presumption against prior restraint. The phrase Vietnam Syndrome entered the political vocabulary in the late 1970s to describe a domestic resistance to large-scale ground commitments abroad that constrained American military choices through the end of the Cold War (KC-8.1.II.C.ii).

The antiwar movement that grew up alongside the war reshaped American political culture. Students for a Democratic Society, founded in 1962, organized the first national teach-ins against the war in spring 1965 and the October 1967 march on the Pentagon. Vietnam Veterans Against the War, organized in 1967, gave the movement a credibility that no purely civilian organization could match; John Kerry's 1971 testimony before the Senate Foreign Relations Committee, asking how the United States could ask a man to be the last man to die for a mistake, became the iconic veteran statement of opposition. Draft resistance grew as the lottery system instituted in December 1969 made the burden of induction more visible. By the early 1970s the war had reached every American institution, from the Catholic and Protestant churches that organized clergy and laity against the war, through the academy where the Pentagon Papers were copied and distributed, to the music industry whose post-Woodstock catalogue cannot be read apart from the war (KC-8.1.I.B.ii).

The four sources below sample the diplomatic, the legislative, the cinematic, and the documentary records of the war. Together they trace the arc from authorization through credibility crisis to formal end.

1. (Causation) Trace the causal chain from Truman's underwriting of the French Indochina war to Lyndon Johnson's commitment of combat troops in 1965. At which step in the chain do you think a different decision could have produced a different outcome, and why?
2. (Continuity and Change) Compare the Truman, Eisenhower, Kennedy, Johnson, and Nixon Vietnam policies. Identify the elements of containment that remained constant across all five presidencies and the elements that shifted. Which set is more historically consequential, and on what grounds?
3. (Comparison) Compare the public reception of the Tet Offensive of January 1968 with the actual battlefield outcome. What does the gap between perception and event reveal about the role of media, official statements, and casualty reporting in shaping democratic accountability for war?
4. (Causation) Account for the rise of the antiwar movement on American college campuses between 1965 and 1970. How did the draft, the Selective Service lottery of December 1969, the Cambodian incursion, and the Kent State and Jackson State killings reshape the movement's composition and tactics?
5. (Continuity and Change) The War Powers Resolution of 1973 was meant to prevent another Vietnam. Drawing on the Persian Gulf War of 1991, the Iraq War of 2003, and the post-2001 use of the Authorization for Use of Military Force, evaluate whether the resolution has produced the institutional change its drafters intended.

Draft alignment — pending educator review. AP USH codes correspond to the official College Board Course and Exam Description (Effective Fall 2023, Version 1). Statements below are paraphrased in the CountryReports voice; refer to the College Board's published CED for verbatim wording.