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Vietnam War
1955–1975· War· Asia
Well documentedSolid records, physical evidence or scientific consensus.
Communist North Vietnam and southern guerrillas fought South Vietnam and the US; it ended with Communist victory in 1975.
See it on the History map →What happened
After Vietnam won independence from France in 1954, it was split into a Communist North under Ho Chi Minh and an anti-Communist South. Southern guerrillas, the Viet Cong, backed by the North, fought the Saigon government. The US sent advisers, then combat troops from 1965, peaking at about 540,000 in 1969; South Korea sent about 320,000 over the war. The 1968 Tet Offensive turned American opinion against it. US forces left in 1973; Saigon fell in April 1975.
Why it matters
Widely seen as America's first lost war, it made Americans wary of foreign wars for a generation and left all of Vietnam under Communist rule.
How we know
Government records including the leaked Pentagon Papers (1971), wide TV coverage, and memoirs and archives from both sides. Deaths: roughly 1 to 3 million Vietnamese and about 58,000 Americans; estimates vary.
Still debated
Whether the war was winnable, and whether it was mainly a Cold War struggle or a nationalist fight for independence, are long-running debates.
Connections (2)
▸Vietnam War was a proxy war of the Cold WarMostly agreed
The connection
US leaders saw Vietnam as a domino: if it fell to Communism, its neighbors would follow. The Soviet Union and China supplied North Vietnam with weapons and aid, while the US fought for the South. The superpowers never fought each other directly, making it a classic proxy war.
When and how
Vietnam, 1955–1975; Eisenhower stated the 'domino theory' in 1954; Soviet and Chinese aid flowed to Hanoi throughout.
How sure are we?
US documents, including the Pentagon Papers, show Cold War motives; Soviet and Chinese records confirm their aid.
Debates and open questions
Many historians argue Vietnam's leaders were driven more by nationalism than by Moscow or Beijing; beyond Laos and Cambodia, the feared dominoes did not fall.
▸Vietnam War grew out of Decolonization: the end of empiresMostly agreed
The connection
Vietnam's war began as a fight to end French colonial rule. Ho Chi Minh declared independence in 1945, and his Viet Minh defeated France at Dien Bien Phu in 1954. The Geneva Accords split the country pending elections that never took place. Many Vietnamese saw the American war as the same independence struggle continued.
When and how
Hanoi, September 2, 1945, declaration of independence; First Indochina War, 1946–1954; Geneva conference, 1954.
How sure are we?
Ho's declaration quoted the US Declaration of Independence; French, American and Vietnamese records trace the colonial war flowing into the American one.
Debates and open questions
Whether the war was mainly anti-colonial, a civil war among Vietnamese, or a Cold War contest is debated; most historians say it was all three.