The Vietnam War (1955-1975)
The Vietnam War was a prolonged armed conflict between communist North Vietnam, supported by the Soviet Union and China, and the non-communist South Vietnam, supported primarily by the United States. Fought across Vietnam, Laos, and Cambodia, the war became the second of the Indochina Wars and a major proxy conflict of the Cold War. The war's enormous human cost—an estimated 1-3 million Vietnamese and 58,000 American dead—along with its atrocities, contested strategies, and lasting political consequences, made it one of the most consequential and bitterly debated conflicts of the 20th century.
Events
Geneva Accords Divide Vietnam
The Geneva Conference concludes with accords that temporarily divide Vietnam at the 17th parallel, with Ho Chi Minh's Viet Minh controlling the North and a Western-aligned state governing the South. Nationwide elections for reunification are scheduled for 1956 but are never held. The division sets the stage for the Vietnam War.
Proclamation of the Republic of Vietnam
Ngo Dinh Diem, having consolidated power after a referendum that deposed Emperor Bao Dai, proclaims the Republic of Vietnam (South Vietnam) with himself as president. Diem's authoritarian rule, nepotism, and persecution of Buddhists alienate large segments of the population, fueling support for the communist insurgency.
Location: Saigon, South Vietnam
Formation of the National Liberation Front (Viet Cong)
Hanoi establishes the National Liberation Front (NLF), commonly called the Viet Cong, to lead the insurgency in South Vietnam. The NLF combines communist and nationalist elements, drawing support from peasants alienated by Diem's land policies and rural repression. North Vietnam begins funneling troops and supplies via the Ho Chi Minh Trail through Laos and Cambodia.
Location: South Vietnam
Assassination of Ngo Dinh Diem
South Vietnamese generals, with tacit US approval, execute a coup that results in the assassination of President Diem and his brother Ngo Dinh Nhu. The coup plunges South Vietnam into a period of political instability, with a rapid succession of military juntas. The instability accelerates the insurgency and deepens US involvement.
Location: Saigon, South Vietnam
Gulf of Tonkin Incident and Resolution
After reports (later disputed) of an unprovoked North Vietnamese attack on the USS Maddox in the Gulf of Tonkin, the US Congress passes the Gulf of Tonkin Resolution, granting President Lyndon B. Johnson broad authority to use military force in Vietnam without a formal declaration of war. The resolution becomes the legal basis for the massive US escalation that follows.
Location: Gulf of Tonkin / Washington, DC
US Combat Troops Land at Da Nang
3,500 US Marines land at Da Nang, marking the arrival of the first American ground combat units in Vietnam. President Johnson authorizes Operation Rolling Thunder, a sustained bombing campaign against North Vietnam. By year's end, 184,000 US troops are in country, and the US is deeply committed to the ground war.
Location: Da Nang, South Vietnam
The Tet Offensive
North Vietnamese and Viet Cong forces launch the Tet Offensive, a coordinated series of surprise attacks on over 100 towns and cities across South Vietnam, including the US Embassy in Saigon. Although a military defeat for the communists—who suffer massive casualties and fail to hold any captured territory—the offensive is a strategic and psychological victory, turning US public opinion decisively against the war.
Location: Throughout South Vietnam
My Lai Massacre
US soldiers of Charlie Company, 1st Battalion, 20th Infantry Regiment, massacre between 347 and 504 unarmed Vietnamese civilians, mostly women, children, and elderly, in the hamlet of My Lai. The atrocity is initially covered up but later exposed, becoming a symbol of the war's brutality and further eroding public support for US involvement.
Location: My Lai, Quang Ngai Province, South Vietnam
Vietnamization and US Troop Withdrawal
President Richard Nixon announces the Vietnamization policy: gradually withdrawing US troops while expanding, equipping, and training South Vietnamese forces to take over combat responsibilities. US troop levels peak at 543,400 in April 1969, then steadily decline. The policy shifts the burden of ground combat to the Army of the Republic of Vietnam (ARVN), with mixed results.
Location: South Vietnam
US Invasion of Cambodia
US and South Vietnamese forces invade Cambodia to attack North Vietnamese supply bases and sanctuaries. The incursion widens the war, destabilizing Cambodia and paving the way for the Khmer Rouge's rise. At home, the invasion sparks massive protests, including the shooting of student protesters at Kent State University by Ohio National Guardsmen.
Location: Cambodia
The Pentagon Papers
The New York Times begins publishing the Pentagon Papers, a top-secret Department of Defense study revealing that the US government had systematically misled the American public about the scope, costs, and prospects of the Vietnam War. The publication triggers a landmark First Amendment Supreme Court case and deepens public distrust of government institutions.
Location: United States
The Easter Offensive
North Vietnam launches its largest offensive of the war, sending 120,000 troops across the DMZ and from Cambodia in a conventional three-pronged attack. The US responds with Operation Linebacker, massive bombing campaigns that halt the offensive. The ARVN holds with intense US air support, but the battle reveals South Vietnam's continued dependence on American firepower.
Location: Quang Tri / Kontum / An Loc, South Vietnam
Paris Peace Accords
The United States, North Vietnam, South Vietnam, and the Provisional Revolutionary Government sign the Paris Peace Accords, establishing a ceasefire and calling for the withdrawal of remaining US forces. Key provisions include the release of American prisoners of war and respect for the DMZ. The accords hold no real mechanism for enforcement, and fighting between North and South Vietnam resumes almost immediately.
Location: Paris, France
Fall of Saigon
North Vietnamese tanks crash through the gates of the Presidential Palace in Saigon, ending the war. In the preceding days, the US conducts Operation Frequent Wind, the largest helicopter evacuation in history, airlifting over 7,000 American and South Vietnamese personnel from the embassy rooftop. South Vietnam surrenders unconditionally. The following year, Vietnam is officially reunified as the Socialist Republic of Vietnam.
Location: Saigon, South Vietnam