GCSE History: The Vietnam War Guide

Why the USA got involved

The USA supported non-communist South Vietnam against the communist North, driven by "containment" policy and the domino theory — the fear that if one country fell to communism, neighbouring countries would follow.

Fighting the war

US forces struggled against guerrilla warfare tactics used by the Viet Cong, who were hard to distinguish from civilians and used jungle terrain and tunnel networks to their advantage.

The Tet Offensive (1968)

The Tet Offensive was a major surprise attack by North Vietnamese and Viet Cong forces. Although a military setback for them, it shocked the American public and undermined confidence that the war was close to being won.

Growing opposition and withdrawal

Media coverage, rising casualties and events like the My Lai Massacre fuelled growing anti-war protest in the USA, eventually leading to US withdrawal in 1973 and the fall of South Vietnam in 1975.

Common mistakes

• Assuming the Tet Offensive was a military victory for North Vietnam — its main impact was on American public opinion, not the battlefield.
• Forgetting guerrilla warfare tactics, not just conventional battles, shaped much of the conflict.
• Treating US withdrawal in 1973 as the same moment South Vietnam fell (1975).