Conflict and Tension in Asia 1950–1975
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Cold War Context
The Korean and Vietnam Wars were fought in the context of Cold War rivalry between the USA and USSR, and the US policy of containing communism.
The domino theory drove US involvement in both Korea and Vietnam — fear that losing one country would trigger a chain reaction across Asia.
Cold War Context — Key Knowledge
- Cold War global rivalry between capitalist USA and communist USSR after 1945
- Truman Doctrine 1947 — US policy to contain the spread of communism
- Domino theory if one country fell to communism, neighbouring countries would follow
- Containment US strategy to prevent communism from spreading beyond its existing borders
Division of Korea
Korea was divided at the 38th parallel in 1945, creating a communist North and capitalist South backed by rival superpowers.
The division of Korea into two rival states mirrored the wider Cold War division of the world.
Division of Korea — Key Knowledge
- 38th parallel dividing line between North and South Korea, agreed 1945
- North Korea communist, led by Kim Il-sung, backed by USSR and China
- South Korea capitalist, led by Syngman Rhee, backed by USA
- North Korean invasion 25 June 1950, crossed the 38th parallel, pushed South to Pusan Perimeter
UN Intervention and Inchon
The UN Security Council authorised military action against North Korea, enabled by the USSR's absence from the vote.
The USSR's absence from the Security Council was the critical factor enabling UN intervention — without it, the Soviet veto would have blocked action.
UN Intervention and Inchon — Key Knowledge
- UN Security Council vote USSR was boycotting over China's seat, so could not veto
- 16 nations contributed troops but USA provided the vast majority
- General MacArthur US commander of UN forces
- Inchon landing September 1950 — amphibious assault behind North Korean lines, recaptured Seoul
- Advance north UN forces pushed to the Yalu River on the Chinese border
Chinese Intervention and Stalemate
China's entry into the Korean War in November 1950 transformed the conflict into a prolonged stalemate.
MacArthur's sacking showed that civilian control of the military mattered — Truman chose limited war over risking nuclear conflict with China and the USSR.
Chinese Intervention and Stalemate — Key Knowledge
- Chinese intervention November 1950 — 200,000 Chinese "volunteers" crossed the Yalu River
- UN forces pushed back south of Seoul by January 1951
- MacArthur sacked April 1951 — wanted to invade China and use nuclear weapons, Truman refused
- Stalemate front line settled near 38th parallel, trench warfare
- Armistice 27 July 1953 — ceasefire, DMZ established, no peace treaty signed
- Casualties approximately 4 million dead, majority Korean civilians
- Korea remains divided today
French Indochina and Geneva
France's defeat in Vietnam and the Geneva Accords created a divided country that drew the USA into escalating involvement.
France's defeat created a power vacuum that the USA filled, driven by the domino theory and fear of communist expansion in Southeast Asia.
French Indochina and Geneva — Key Knowledge
- French Indochina France controlled Vietnam as a colony
- Ho Chi Minh led the Viet Minh independence movement, communist
- Dien Bien Phu 1954 — decisive French defeat, surrender to Viet Minh
- Geneva Accords 1954 — Vietnam temporarily divided at the 17th parallel
- North Vietnam communist, Ho Chi Minh
- South Vietnam non-communist, Ngo Dinh Diem
- Elections promised for 1956 never held — USA and Diem feared Ho Chi Minh would win
Diem and the Viet Cong
Diem's corrupt and repressive regime in South Vietnam fuelled opposition and the growth of the communist Viet Cong guerrilla movement.
Diem's failures meant the USA was propping up a government that lacked popular support — a fundamental problem throughout the war.
Diem and the Viet Cong — Key Knowledge
- Diem's regime corrupt, authoritarian, Catholic in a Buddhist country, persecuted opponents
- Strategic Hamlet Programme forced villagers into fortified settlements — deeply unpopular, pushed people towards the Viet Cong
- Viet Cong NLF — communist guerrillas in South Vietnam
- Ho Chi Minh Trail supply route through Laos and Cambodia to Viet Cong
- Diem overthrown November 1963 — military coup, Diem assassinated, US aware and did not stop it
US Escalation
US involvement escalated from advisors under Kennedy to full-scale combat under Johnson, authorised by the Gulf of Tonkin Resolution.
The Gulf of Tonkin Resolution effectively gave the president a blank cheque for war — Congress later felt it had been misled.
US Escalation — Key Knowledge
- Kennedy's advisors increased from 900 to 16,000 military advisors by 1963
- Gulf of Tonkin incident August 1964 — North Vietnamese torpedo boats allegedly attacked USS Maddox, second attack almost certainly did not happen
- Gulf of Tonkin Resolution gave Johnson power to escalate without formal declaration of war, passed almost unanimously
- Operation Rolling Thunder sustained bombing of North Vietnam from March 1965
- First US combat troops landed March 1965
- Troop escalation numbers rose to 500,000 by 1968
Guerrilla Tactics and US Response
The Viet Cong used guerrilla tactics that negated US technological superiority, while US counter-tactics often alienated the civilian population.
The Viet Cong's slogan — "the people are the water, the guerrilla is the fish" — captured the fundamental US problem: the enemy was indistinguishable from the civilian population.
Guerrilla Tactics and US Response — Key Knowledge
- Guerrilla tactics hit-and-run attacks, booby traps including punji sticks, tunnel networks such as Cu Chi, blending with civilian population
- Ho Chi Minh Trail supply route kept open by 40,000 workers despite heavy US bombing
- US tactics search and destroy missions, Agent Orange defoliant, napalm incendiary weapon, B-52 carpet bombing, "body count" as measure of success
- Strategic hamlets forced relocation of villagers — deeply unpopular
Tet Offensive
The Tet Offensive of January 1968 was a military defeat for the Viet Cong but a decisive political turning point that shattered American confidence in the war.
Tet was the moment America began looking for a way out rather than a way to win — the war was lost politically even as it continued militarily.
Tet Offensive — Key Knowledge
- Tet Offensive January 1968 — surprise attack on over 100 cities and towns during Vietnamese New Year
- US Embassy in Saigon attacked symbolically devastating even though attackers were killed
- Military outcome Viet Cong suffered heavy losses, failed to hold any major city
- Political impact proved the war was not being won despite government claims of progress
- Credibility gap gap between official optimism and reality seen on television
- Johnson decided not to run for re-election, March 1968
Media, My Lai and the Anti-War Movement
Vietnam was the first "television war" — graphic media coverage and atrocities like My Lai fuelled a powerful anti-war movement that made the war politically unsustainable.
The combination of media coverage and the anti-war movement made Vietnam the first war America lost at home as much as on the battlefield.
Media, My Lai and the Anti-War Movement — Key Knowledge
- Television war first conflict with daily TV coverage in American homes
- Iconic images Nick Ut's napalm girl photo of Kim Phuc, Saigon execution photo
- My Lai massacre March 1968 — US troops killed 347–504 unarmed civilians, covered up for over a year, Lieutenant Calley convicted
- Anti-war movement draft-card burning, March on Washington 1967, Kent State shootings May 1970 — National Guard killed 4 student protesters
- Muhammad Ali refused draft on religious grounds
- Pentagon Papers 1971 — leaked documents proved government had systematically lied about the war
Vietnamisation and Nixon
Nixon's policy of Vietnamisation aimed to withdraw US troops while training the South Vietnamese army to fight alone, but secretly expanded the war into Cambodia and Laos.
Vietnamisation was widely seen as a face-saving exercise — "peace with honour" meant withdrawing without admitting defeat.
Vietnamisation and Nixon — Key Knowledge
- Vietnamisation gradual withdrawal of US troops, training ARVN to take over
- Troop withdrawal numbers fell from 500,000 to 27,000 by 1972
- Secret bombing of Cambodia 1969–1970, revealed to Congress and public
- Invasion of Cambodia 1970) and Laos (1971) to disrupt Ho Chi Minh Trail, Kent State (May 1970 — protests against Cambodia invasion led to National Guard shooting of students
- ARVN weaknesses poor leadership, corruption, low morale
Paris Peace and Fall of Saigon
The Paris Peace Accords ended direct US involvement, but without American support South Vietnam fell to a conventional North Vietnamese invasion within two years.
The fall of Saigon marked the failure of 20 years of US containment policy in Vietnam — communism won despite enormous American investment in blood and treasure.
Paris Peace and Fall of Saigon — Key Knowledge
- Paris Peace Accords January 1973 — ceasefire, US withdrawal, POWs released, but North Vietnamese forces allowed to remain in South
- Fall of Saigon 30 April 1975 — North Vietnamese forces captured Saigon, iconic helicopter evacuation from US Embassy
- Vietnam reunified under communist rule as Socialist Republic of Vietnam
- US casualties 58,000 Americans dead
- Vietnamese casualties 2–3 million Vietnamese dead
- Agent Orange legacy birth defects and environmental damage lasting decades
- Vietnam Syndrome American reluctance to commit troops abroad after the trauma of Vietnam
- Cambodia fell to Khmer Rouge, genocide followed
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Conflict and Tension in Asia 1950–1975
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