Vietnam War

The Vietnam War was a long and devastating conflict in Southeast Asia that pitted communist North Vietnam and its allies against South Vietnam and its main backer, the United States. Conventionally dated from 1955, though its roots and its end stretch well beyond that year, it became one of the defining episodes of the Cold War, costing millions of lives and reshaping American politics, military thinking, and public attitudes toward foreign intervention.

The origins lay in the struggle against French colonial rule. After World War II, the Viet Minh, led by the communist nationalist Ho Chi Minh, fought France in the First Indochina War. France's defeat at Dien Bien Phu in 1954 led to the Geneva Accords, which temporarily divided Vietnam at roughly the 17th parallel and called for national elections. Those elections never took place. The north was governed by Ho Chi Minh's communist state, while the south came under an anticommunist government that, after 1955, was headed by Ngo Dinh Diem with American support. Washington, guided by the "domino theory," feared that the fall of one country to communism would topple its neighbors.

Fighting in the south grew through the late 1950s as communist-led insurgents, later known as the Viet Cong, challenged the Saigon government, with backing and direction from Hanoi. The United States steadily increased its military advisers and aid. After the disputed Gulf of Tonkin incidents in 1964, Congress authorized broad presidential war powers, and in 1965 American combat troops arrived in large numbers. The war that followed combined jungle guerrilla fighting, large-scale ground operations, and an extensive bombing campaign against the north and supply routes in neighboring Laos and Cambodia. The 1968 Tet Offensive, though a military setback for communist forces, shook American confidence by contradicting official optimism.

Domestic opposition grew, and President Richard Nixon pursued "Vietnamization," withdrawing U.S. troops while building up South Vietnamese forces. The Paris Peace Accords of 1973 ended direct American involvement, but fighting between Vietnamese forces continued. In April 1975, North Vietnamese forces captured Saigon, and the country was formally reunified under communist rule the following year.

Estimates of the dead vary widely, but most historians agree that well over a million Vietnamese soldiers and civilians died, along with roughly 58,000 Americans. Laos and Cambodia also suffered heavily, and the region saw refugee flows and further upheaval, including the Khmer Rouge's rise in Cambodia. In the United States, the war deepened distrust of government, prompted the end of the draft, and fed a long debate over the limits of military power, often called the "Vietnam syndrome." Vietnam itself later adopted market-oriented reforms and restored relations with the United States in 1995.