Conflict and Tension in Asia, 1950–1975

How this unit works

This is your Paper 1 Section B wider world depth study (option 1B/D). It is worth 44 marks — 40 for content plus 4 SPaG marks on Question 4 — and you should spend about an hour on it. The four questions are always the same shape: Q1 — a statement about Source A and “How do you know?” (4 marks); Q2 — how useful are Sources B and C? (12); Q3 — write an account (8); Q4 — “how far do you agree?” with a statement about a main reason (16 + 4 SPaG). The methods for answering each question live in the Exam Skills section. This unit gives you the knowledge.

• Sources matter a lot here — 16 of the 40 marks. The sources in this option are mostly photographs, TV footage, official statements and protest material, because Vietnam was the first war fought in front of cameras. The Source Workbench at the end tells you what each type can and cannot show.
• Question 4 always names a “main reason”. In June 2025 it was: “The Tet Offensive was the main reason America failed to win the war in Vietnam.” So for every big event you need more than one cause — you need to be able to rank them. The Factor Hierarchies at the end do exactly that.

The questions historians genuinely argue over

Timeline: the events you must place

Learn the order before the detail — the sections explain each event. In a depth study, dates earn marks.

Part one — conflict in Korea, 1945–1953

Part two — escalation in Vietnam, 1945–1968

Part three — the ending of the war, 1968–1975

Key people

Korea

Vietnam

Key vocabulary

These are the specialist terms that earn the SPaG marks on Question 4. They are defined here once and used throughout.

Chapter 1 — Conflict in Korea

The Korean War was the Cold War's first real shooting war. It lasted three years, killed millions of people — and ended with the border almost exactly where it started. This chapter explains why the war broke out, how the fighting swung wildly up and down the peninsula before freezing, and what it changed: for Korea, for the United Nations, and for America and China.

1.1 One nation, two states: how Korea was divided

Start with nationalism. Japan ruled Korea as a colony from 1910 to 1945, and ruled it brutally. Korean culture was suppressed, resistance was punished, and thousands of nationalists were killed. Many escaped to China or the USSR — some set up a government-in-exile, others fought the Japanese as guerrillas. By 1945, Koreans of every political type wanted the same thing: a free, united, independent Korea. They never got it.

The division was the superpowers' shortcut. On 8 August 1945 the USSR declared war on Japan and its troops poured into northern Korea. The USA worried Stalin would take the whole peninsula, so it suggested splitting Korea at the 38th parallel — and Stalin agreed, because his forces were outnumbered in the region and America had just used the atomic bomb. Soviet troops occupied the north (about 9 million people); American troops the south (about 16 million, including the capital, Seoul). Elections to reunite the country were promised. As the USA and USSR fell out, the elections never happened. Instead, in 1948, two rival states appeared: the Republic of Korea in the south (August) and the Democratic People's Republic of Korea in the north (September). Each claimed to be the true government of all Korea.

1.2 Why the North invaded in June 1950

First, the China background. In October 1949 Mao Zedong's communists won the Chinese Civil War. America's ally Chiang Kai-shek fled to the island of Taiwan (Formosa) — even though America had given him around $2 billion in aid since 1946. The shock in America was huge: the world's biggest country had “fallen” to communism. Washington refused to recognise Mao's government and made sure China's seat at the UN stayed with Chiang's government on Taiwan. But notice what America had not done: it had not sent troops to save Chiang. Stalin noticed too. Then, in January 1950, the US Secretary of State described America's “defensive perimeter” in Asia — the line it would definitely fight to hold — and left Korea (and Taiwan) outside it.

Then, the decision. Kim Il Sung had been asking Stalin for permission to invade since 1948, and Stalin had kept saying no. In 1950 he said yes. Three things had changed his mind. The communist win in China meant around 70,000 experienced Korean soldiers who had fought for Mao could come home and join Kim's army. American signals suggested the USA would not fight for Korea — it had not fought for Chiang. And a quick victory would spread communism at no direct Soviet cost. Stalin supplied tanks, aircraft and weapons — but no Soviet troops — and Mao agreed to back the North if things went wrong. On 25 June 1950 the North Korean army crossed the 38th parallel. The South had no tanks and little air power, and it collapsed: Seoul fell in about three days, and within weeks the North held nearly the whole peninsula. Everything had gone to plan — except that America decided to fight.

1.3 The American and UN response

Why America acted. In 1947 President Truman had promised that America would help free peoples resist communist takeover — the Truman Doctrine, the policy known as containment. Most Americans also believed in what became the Domino Theory: let communism take one country and the neighbours fall next. After losing China in 1949, Korea looked like the next domino. And with elections coming in November 1950, Truman could not afford to look weak. This time, America would fight.

Why it became a UN war. America took the invasion to the United Nations Security Council — and got lucky. The USSR was boycotting the Council in protest at China's seat being kept from Mao's government, so it was not there to use its veto. The Council passed resolutions naming North Korea the aggressor, ordering it out, and asking members to help the South. A UN force was put together under the American general Douglas MacArthur — a famous, and famously arrogant, hero of the war against Japan. Troops came from many countries, including Britain, Canada, Australia and Turkey — but the muscle was American: roughly half the troops, nine-tenths of the aircraft and most of the ships came from the USA (South Korea itself provided the largest number of soldiers overall). The USSR came back to the Council within weeks — too late.

1.4 The war swings: Pusan, Inchon, the Yalu and China

In its first year the front line swept up and down Korea four times. Learn it as four swings:

1. North Korea nearly wins (June–September 1950). The North's tanks pushed the UN and South Korean forces into one small corner of the south-east — the Pusan perimeter. MacArthur rushed in reinforcements, and the line just held.
2. Inchon turns the war around (September–October 1950). On 15 September 1950 MacArthur landed troops from the sea at Inchon, a port near Seoul far behind enemy lines. It was a huge gamble — the tides made a landing there almost impossible — and it worked perfectly. Trapped between the Inchon force and the troops breaking out of Pusan, the North Korean army fell apart. Thousands were killed or captured, and by early October the South had been won back. At this point, containment had already worked. What happened next went further.
3. The UN invades the North (October–November 1950). With UN approval, and now aiming to reunite the whole of Korea, MacArthur's forces crossed the 38th parallel and drove north towards the Yalu River — the border with China. Mao warned again and again that China would not accept American armies on its doorstep. The warnings were ignored.
4. China hits back (from late October 1950). Around 200,000 Chinese troops crossed the Yalu — officially “People's Volunteers”, so that China and America were never formally at war — and smashed into the over-stretched UN armies. The UN was thrown back below the parallel. Seoul fell for the second time in January 1951 and was retaken in March after bitter fighting. By spring 1951 the front line had settled close to where the war began — and it barely moved for the next two years.

1.5 The sacking of MacArthur

By spring 1951 Truman and MacArthur wanted two different wars. Truman was satisfied: the invasion had been thrown back, containment had worked, and his priority now was to stop the war growing into World War Three — with the USSR involved, and possibly atomic bombs. MacArthur wanted to win outright: he pushed to blockade and bomb China itself, to use Chiang's troops from Taiwan, and he saw atomic weapons as an option. Told to keep quiet, he did the opposite. He issued his own threat to China, wrecking Truman's peace feelers, and wrote a letter — read out in Congress — declaring that “there is no substitute for victory”. A general publicly defying the elected President was a challenge no president could ignore. On 11 April 1951 Truman sacked him. The reaction: MacArthur flew home to ticker-tape parades and a hero's welcome, while Truman's popularity sank. But the decision stood — and the war stayed limited.

1.6 Stalemate, armistice and what the war changed

Stalemate. From mid-1951 the war froze along dug-in lines near the 38th parallel — trenches, minefields, and hills fought over for tiny gains, while American bombing flattened the North's cities. Peace talks started in July 1951 (eventually at Panmunjom) and dragged on for two years. The biggest sticking point was prisoners of war: thousands of communist prisoners did not want to go home, the UN refused to force them, and the communists demanded them back. Two things finally broke the deadlock. Eisenhower won the presidency in November 1952 promising to end the war — and hinted he might escalate if talks kept failing. Then Stalin died in March 1953, and China and North Korea could no longer be sure of Soviet backing. The armistice was signed at Panmunjom on 27 July 1953. The border froze close to the 38th parallel, with a fortified demilitarised zone (DMZ) between the two armies. Prisoners went home only if they chose to — the UN won that point. It was a ceasefire, not a peace treaty. No peace treaty has ever been signed.

What three years of war changed:

• For Korea — ruin, and no change. The peninsula was devastated. Total deaths are usually estimated in the millions, most of them Korean civilians (the figures vary — say they are estimates); America lost around 36,000+ dead; China lost hundreds of thousands. The border ended up where it started, and the division became permanent — the two Koreas are still divided, and still technically at war, today.
• For the UN — a win with an asterisk. It had stood up to aggression with force — something the League of Nations never managed. But it had only been possible because of the Soviet boycott, and the force had really been run by America. The UN never fought a war like it again during the Cold War.
• For America and China — a twenty-year freeze. Their soldiers had killed each other in huge numbers. America refused to recognise Mao's China, kept it out of the UN, and signed a defence deal with Taiwan. There was no real contact until Nixon's visit in 1972 (see 3.1).
• For the Cold War — bigger armies, and a new pattern. American defence spending multiplied several times over; American alliances spread across Asia (Japan, Australia and New Zealand, then SEATO in 1954). And both superpowers had now armed opposite sides of a war without fighting each other — the exact pattern about to repeat, for far longer, in Vietnam.

Chapter 2 — Escalation of conflict in Vietnam

America did not jump into Vietnam — it slid in, one step at a time. Money to the French. Then advisers. Then bombing. Then half a million troops. This chapter explains how France lost its colony, why South Vietnam fell apart, how three presidents each went a step deeper — and how 1968, the year of Tet and My Lai, broke public support for the war.

2.1 The end of French rule: Dien Bien Phu and Geneva

The colonial background. Vietnam — together with Laos and Cambodia — made up French Indochina, a colony run for French profit. Rice, rubber and coal flowed out; French goods flowed in; Vietnamese nationalism was crushed. In the Second World War Japan occupied Indochina and stripped it so bare that famine killed enormous numbers of people — estimates run as high as two million. Resistance was led by the Vietminh, the independence movement founded by the communist Ho Chi Minh and his military commander Vo Nguyen Giap. When Japan surrendered in 1945, Ho declared Vietnam independent. France had other ideas: humiliated in Europe, it wanted its empire back, and it sent an army. The war ran from 1946 to 1954. After Mao's win in 1949, China armed and trained the Vietminh. America — seeing communism, not colonialism — paid for France's war: about $3 billion between 1950 and 1954, most of the total cost.

Dien Bien Phu, 1954. The French could not catch the guerrillas, so they tried to make the guerrillas come to them. They built a fortified base at Dien Bien Phu, in a remote valley, and garrisoned it with about 10,000 troops — bait, to draw the Vietminh into open battle where French guns and aircraft could destroy them. Giap took the bait, on his own terms. His troops dragged artillery up the mountains around the base, piece by piece, destroyed the airstrip, and cut the base off completely. The siege lasted 57 days. Shelled from the heights and starved of supplies, the French surrendered on 7 May 1954 — around 3,000 dead in the siege, thousands more dead as prisoners. France had had enough: the government fell, and parliament voted to leave Indochina for good.

The Geneva Agreement (July 1954) divided Vietnam temporarily at the 17th parallel: Ho Chi Minh would govern the North, a pro-Western government the South, and elections across the whole country were promised for July 1956 to reunite it. Those elections never happened — because everyone, including the Americans, knew Ho Chi Minh would win them, and the South's new leader refused to take part. Like Korea, Vietnam was now two armed states either side of a “temporary” line.

2.2 Diem's South Vietnam and the slide into civil war

America's chosen man in the South was Ngo Dinh Diem. He was reliably anti-communist — the only qualification Washington really checked. Almost everything else about him drove his own people away. He was a Catholic ruling a mostly Buddhist country. He gave the big jobs to his family — his brother ran the secret police. Corruption was everywhere. He let landlords take back land the Vietminh had given to peasants. And he crushed all opposition: roughly 100,000 people were imprisoned in his anti-communist round-ups. In October 1955 he made himself president in a referendum with a ridiculous 98.2% yes vote — and refused the Geneva elections completely. The Buddhist crisis of 1963 showed his rule at its worst: his troops shot dead nine Buddhists at a religious festival, and in June 1963 the monk Thich Quang Duc burned himself to death at a Saigon crossroads in protest. The photograph went around the world — and finished Diem's reputation abroad.

From repression to civil war. Diem made enemies faster than he could jail them. In December 1960 they joined together in the National Liberation Front (NLF) — communists, nationalists, over-taxed peasants and fed-up professionals, soon led by the communists and nicknamed the Vietcong (short for “Vietnamese communists”) by their enemies. The NLF assassinated government officials, took over villages, and fought Diem's American-equipped army — the ARVN — from the jungle. By the early 1960s the Vietcong controlled large parts of the countryside. South Vietnam was in civil war.

2.3 The Vietcong: aims, support and guerrilla war

• Aims. Overthrow the Saigon government, drive out its foreign backers, and reunite Vietnam — under communist rule, though the NLF talked mostly about independence and land.
• Support. The Vietcong's strength was the villages. Peasants gave them food, shelter, information and recruits — some out of belief (land reform, nationalism, hatred of Diem), some out of fear, most out of a mix. Not all supporters were communists. The cause that united them was simple: get the foreigners and their puppets out of Vietnam.
• Leadership and supply. Ho Chi Minh was the movement's inspiration and the North was its engine. From 1959, men, weapons and supplies moved south along the Ho Chi Minh Trail — a constantly shifting network of jungle paths and roads running through Laos and Cambodia. It was bombed throughout the war and never closed: tens of thousands of workers repaired it as fast as it was hit. From the mid-1960s, regular North Vietnamese Army (NVA) units fought in the South alongside the guerrillas.
• Guerrilla tactics. No uniforms — a fighter looked exactly like a farmer. Ambush, then vanish into the jungle, the tunnels or the crowd. Booby traps — sharpened stakes, tripwires, mines — caused about a tenth of American casualties and constant fear. Huge tunnel networks (most famously at Cu Chi) hid fighters, hospitals and weapons workshops underground. In firefights the Vietcong fought as close to American soldiers as possible — “hanging onto their belts” — so that American air power and artillery could not fire without hitting their own men. The plan, Giap's plan, was patience: never risk a big battle; make the war long, expensive and painful; and outlast America's willingness to keep fighting.

2.4 The Domino Theory and intervention under Eisenhower and Kennedy

The Domino Theory. In April 1954, as Dien Bien Phu was falling, President Eisenhower told reporters that the countries of Asia were like a row of dominoes: knock the first one over and the rest go down one after another — Vietnam, then Burma, Thailand, Indonesia and beyond. The image stuck, and it drove American policy in Asia for twenty years. It assumed communism was one single force run from one centre — which was already stopping being true (the USSR and China spent the 1960s falling out) — and it saw Ho Chi Minh as an agent of world communism, when his own followers saw a national independence leader. But after China and Korea, the fear was not stupid. It just made every local conflict in Asia look like a test America could not afford to fail.

• Eisenhower (1953–61): committed, but no combat troops. He refused to send American soldiers to fight. He did everything short of that: he backed Diem's refusal to hold the 1956 elections, sent money, weapons and military advisers to train the ARVN, and set up SEATO (1954) — an alliance with Britain, France, Australia, New Zealand and others to hold the line in Southeast Asia, with South Vietnam under its umbrella.
• Kennedy (1961–63): the adviser war. Kennedy also refused to send combat troops — and increased everything else. Advisers went from under a thousand to about 16,000 by 1963, now training the ARVN in anti-guerrilla tactics and sometimes flying and fighting alongside them, with helicopters and money pouring in.
• The Strategic Hamlets programme (from 1962) was the plan to cut the Vietcong off from the villages: move the peasants into fortified, guarded settlements, so the guerrillas lost their food, shelter and recruits. In practice it dragged families away from their land and their ancestors' graves, put them behind barbed wire, and expected them to be grateful. By 1963 a large share of the rural population had been moved — and the programme had become one of the Vietcong's best recruiting tools. It cut support for the government, not for the guerrillas.

2.5 Johnson's war: Tonkin, Rolling Thunder and search and destroy

The Gulf of Tonkin (August 1964). On 2 August 1964 North Vietnamese patrol boats attacked an American destroyer, USS Maddox, which was supporting secret raids on the North's coast. The ship was barely scratched. Two nights later, in a storm, the Maddox reported a second attack — one that almost certainly never happened (jumpy radar and sonar operators in bad weather; even Johnson privately doubted it). It made no difference. Johnson went to Congress, which passed the Gulf of Tonkin Resolution (7 August 1964) almost unanimously. It let the President take “all necessary measures” to defend South Vietnam — in effect, a blank cheque for war. There was never an actual declaration of war. The entire American war rested on this resolution — and half the incident behind it was imaginary.

• Operation Rolling Thunder (March 1965 – November 1968). A massive, continuous bombing campaign against North Vietnam and the supply routes — nearly 900,000 tons of bombs over three and a half years, killing tens of thousands (the figures are estimates). It did not work. The Trail was dirt track, repaired as fast as it was cratered. The North dug in and dispersed its industry. Morale did not break. And — the lesson of Korea — fear of dragging China openly into the war kept key targets off-limits, so Soviet and Chinese supplies kept arriving. More than 3,000 American aircraft were shot down. In March 1965 the first US combat troops came ashore at Da Nang — initially just to guard the air bases. By 1968 there were about 536,000 American troops in Vietnam.
• Search and destroy. The US commander, General Westmoreland, fought a war of attrition, measured in body counts. Troops flew out by helicopter to villages suspected of hiding Vietcong, searched them, burned what they found, called in air strikes, and flew home. The tactic produced dead guerrillas — and dead civilians, burned villages, and a countryside that hated the soldiers doing the searching. The Vietcong usually slipped away and came back once the helicopters left. Body counts were exaggerated at every level — feeding the official optimism that the public would later remember as lies.
• Chemical war. Operation Ranch Hand (1962–71) sprayed millions of litres of defoliant — above all Agent Orange — to kill the jungle that hid the Trail and the guerrillas, and to destroy their food crops. Napalm burned villages and people without distinction. The chemicals poisoned Vietnam for decades — cancers and birth defects that lasted generations — and photographs of burned children poisoned support for the war at home.

2.6 The home front: the draft and the protest movement

The draft. America fought Vietnam with conscripts: men aged 18 to 26 could be called up, and refusing meant fines or prison. The system was unfair, and everyone could see it. The wealthy escaped through college deferments or friendly doctors, so the men actually sent were disproportionately poor, working-class and Black. About 30% of draft-age African-Americans were drafted, against about 19% of whites — and Black soldiers died at roughly twice their share of the forces. Around 30,000 men fled to Canada; thousands more burned their draft cards in public. The most famous refuser was the world heavyweight boxing champion, Muhammad Ali — stripped of his title and banned from the ring for years, and a hero to both the anti-war and civil rights movements.

The movement. Opposition was strongest among the young — the post-war “baby boom” generation now filling the universities, who rejected their parents' politics along with their music and haircuts. Groups like Students for a Democratic Society organised protests and sit-ins on campuses across the country. Anti-war songs filled the charts. And in October–November 1969 the Moratorium protests became the largest demonstrations in American history up to that point — around half a million people marched on Washington. The country split down the middle, largely along age lines. To many older Americans the protesters were traitors; to the protesters, the war was their parents' lie, paid for with their generation's lives. America was tearing itself apart over the war — something the Vietcong could never have achieved with weapons.

2.7 The Tet Offensive, 1968

The plan. In late 1967 the communists prepared their boldest move of the war. First they attacked remote American bases — above all Khe Sanh — to pull US forces away from the cities. Then, during Tet, the Vietnamese new year holiday — normally an unofficial truce, with half the ARVN away on leave — they abandoned guerrilla tactics and attacked everywhere at once. On 30–31 January 1968 the Vietcong and NVA hit over 100 towns and cities across South Vietnam, including Saigon itself — where a Vietcong squad fought its way into the grounds of the US embassy — and the old capital Hue, which they held through weeks of some of the worst fighting of the war. The hope was that the South's people would rise up and bring down the Saigon government.

The result — two opposite verdicts, both true. On the battlefield, Tet was a disaster for the communists. There was no uprising. US and ARVN forces recovered within days and took back everything. The Vietcong lost around 37,000 killed, wounded or captured — perhaps a fifth of their entire fighting strength, with their southern network crippled for years — against roughly 2,500 American dead. But on television, Tet won the war's most important battle. For years, officials had told Americans the enemy was nearly beaten and the end was in sight. Now Americans watched that same enemy fighting inside the US embassy on the evening news. If the government had been wrong about that — or lying — what else was it wrong about? The credibility gap became a canyon. Walter Cronkite, the most trusted newsman in America, told his viewers the war was stuck in stalemate. Johnson's presidency broke. On 31 March 1968 he stopped most of the bombing, offered peace talks — and stunned the country by announcing he would not run for re-election.

2.8 My Lai and its public impact

On 16 March 1968 — a few weeks after Tet — American soldiers of Charlie Company, led by Lieutenant William Calley, flew into the village of My Lai on a search and destroy mission. They had been told to expect Vietcong fighters and that the villagers fed the enemy. They had lost friends to snipers and booby traps for months. They found only women, children and old men — and murdered them. Estimates of the dead run from 347 to around 500 (American and Vietnamese counts differ — give a range). Women were raped; the village was destroyed. The killing stopped only when an American helicopter pilot, Hugh Thompson, landed his aircraft between the soldiers and the surviving villagers and threatened to open fire on his own side.

The cover-up and the reckoning. The operation was reported up the chain as a victory over enemy fighters. The truth stayed hidden for twenty months — until soldiers who had heard the stories pushed for an investigation, the journalist Seymour Hersh broke the story, and army photographer Ron Haeberle's colour photographs of the dead were published in November 1969 for the whole world to see. Of all those charged, only Calley was convicted — of 22 murders, sentenced to life in March 1971. Within days President Nixon intervened; Calley served most of his sentence under house arrest and was released in 1974.

Chapter 3 — The ending of conflict in Vietnam

Richard Nixon inherited a war America no longer wanted — and refused to simply lose it. His answer was to pull the troops out while escalating everything else. It took four more years, spread the fighting into two more countries, and ended with a peace deal that lasted just long enough for America to get out. This chapter covers Nixon's war, the protests that shadowed it, the Paris peace deal, and the fall of Saigon.

3.1 Nixon's war: Vietnamisation, Cambodia, Laos and the China card

• Vietnamisation. Elected in November 1968 promising “peace with honour”, Nixon's plan was to make South Vietnam fight its own war: pour money, weapons and training into the ARVN — building it towards a million men — while American troops came home. About 85,000 (15% of the force) left by the end of 1969, and numbers fell from over 540,000 in 1969 to under 30,000 by the end of 1972. Fewer Americans died, and the home front quietened. The question was whether the ARVN could stand on its own.
• More bombs, fewer boots. As troops left, the air war grew. Chemical spraying continued (Ranch Hand ran until 1971, and Agent Orange's legacy of poisoned land and birth defects ran on for decades). Heavy bombing of the North — stopped by Johnson in 1968 — came back under Nixon.
• Widening the war: Cambodia and Laos. The Ho Chi Minh Trail and the Vietcong's safe bases sat across the border in neutral Cambodia and Laos. From March 1969 Nixon bombed Cambodia in secret — hidden from Congress and the public. In April 1970 US and ARVN troops openly invaded Cambodia, setting off the biggest protests of the war (see 3.2 — Kent State). In February 1971 the ARVN invaded Laos on its own — and was routed, retreating in chaos. Vietnamisation's weakness was now on display to Washington and Hanoi alike. Encouraged, North Vietnam invaded the South in March 1972 — the Easter Offensive, with tanks and regular troops. Nixon hit back with Operation Linebacker: massive bombing with new precision-guided weapons, and the mining of Haiphong harbour. The offensive was stopped. But the man elected to end the war had spread it into two more countries — and the chaos in Cambodia would end, after 1975, in the Khmer Rouge's genocide.
• The China card. Nixon's cleverest move was not military at all. The USSR and China had fallen out badly — and Nixon exploited it. “Ping-pong diplomacy” in 1971 led to Nixon visiting Beijing in February 1972 — the first American president ever to visit communist China — and Moscow in May. Suddenly both communist giants cared more about their new relationship with Washington than about their ally in Hanoi, and both leaned on North Vietnam to make a deal. America was arranging its exit over Hanoi's head, with Hanoi's own backers.

3.2 Opposition: Kent State, the television war and Watergate

Kent State (4 May 1970). Nixon's announcement of the Cambodia invasion set campuses across America alight. At Kent State University in Ohio, the National Guard was sent onto campus. During a midday protest — with some students throwing stones — guardsmen opened fire into the crowd, killing four students and wounding nine. Days later, police killed two more students at Jackson State College in Mississippi. The photograph of a young woman screaming over a dying student became one of the defining images of the era. Hundreds of colleges shut down in the nationwide strike that followed. None of the guardsmen were successfully prosecuted. American soldiers had shot American students at a protest about the war. For many people, that was the moment the war truly came home.

The television war. Vietnam was the first war fought in front of uncensored cameras. When the Korean War started in 1950, about 9% of American homes had a TV; by 1961 it was around 93%. New lightweight cameras let journalists film real combat and put it on the evening news within days. Families at dinner saw what war actually looked like: a Saigon police chief executing a prisoner in the street (1968), children burned by napalm (1972), the My Lai photographs, coffins coming home. How much the media mattered is genuinely argued. Critics said television lost the war by draining public morale. Others reply that the deaths, the draft and the official lies changed people's minds, and the cameras just showed the truth — following opinion as much as leading it. What nobody disputes: no government could keep claiming the war was going well against what people could see on screen.

Watergate — the backdrop to the end. In June 1972 burglars linked to Nixon's re-election campaign were caught breaking into the Democratic Party's offices at the Watergate building. Nixon probably did not order the break-in — but he was proved to have covered it up, and in August 1974 he resigned rather than be impeached: the only US president ever to resign. Watergate mattered for Vietnam twice over. It finished off public trust — if the President lied about this, what had he lied about in Vietnam? (The leaked Pentagon Papers had already revealed years of official lying about the war.) And it destroyed the government's power to act: a disgraced White House and an angry Congress — which cut aid to Saigon and banned new military action — meant that when North Vietnam attacked again, no American rescue was coming.

3.3 Paris, withdrawal and the fall of Saigon

The Paris peace talks had opened after Tet in 1968 and got nowhere for years. The real progress happened in secret talks between Nixon's adviser Henry Kissinger and North Vietnam's Le Duc Tho. By October 1972 a deal was close — “peace is at hand”, Kissinger announced, days before the election. Then Hanoi stalled and Saigon's President Thieu refused to sign. Nixon's answer was Linebacker II — the “Christmas bombing” of December 1972: the heaviest air raids of the entire war, on Hanoi and Haiphong — while he privately threatened Thieu with total abandonment unless he signed. Both came back to the table. The Paris Peace Accords were signed on 27 January 1973. The terms:

• An immediate ceasefire in place — which meant North Vietnamese troops stayed inside South Vietnam, keeping the ground they stood on. This was the fatal flaw.
• All US forces out within 60 days; all American prisoners of war returned.
• Vietnam to be peacefully reunited through talks and elections — promises nobody seriously expected to be kept.
• Continued American aid and equipment for Saigon — a promise Congress soon gutted.

The end. The last American troops left by March 1973. Kissinger and Le Duc Tho were awarded the Nobel Peace Prize — Tho refused it, saying there was no peace. He was right: the ceasefire collapsed almost at once, and thousands of ARVN soldiers were dead within months. In December 1974 North Vietnam seized a southern province as a test. America — Nixon gone, Congress opposed — did nothing. That was the answer Hanoi needed. In spring 1975 it launched its final invasion, and the ARVN — built at such enormous cost — collapsed in weeks. On 30 April 1975 Saigon fell: North Vietnamese tanks crashed through the gates of the presidential palace while the last Americans, and desperate Vietnamese who had worked with them, were lifted off rooftops by helicopter. Vietnam was reunited under communist rule. In Vietnam, containment had completely failed.

3.4 The price of the war and Vietnam in 1975

Vietnam's problems in 1975 did not end with victory. The country was reunited (formally as the Socialist Republic of Vietnam in 1976) but wrecked: bombed-out roads and bridges, cratered and poisoned farmland, cities full of refugees, an economy broken by thirty years of war. The new government sent hundreds of thousands of southerners — ex-soldiers, officials, professionals — to “re-education” camps. Forcing farms into state ownership made the economic misery worse. And an American trade embargo cut Vietnam off from Western trade and aid for twenty years. For many Vietnamese, the peace was almost as hard as the war.

Pulling it together, 1950–1975

Change over time

Factor hierarchies for the main-reason essay

Question 4 names a “main reason” and asks how far you agree. These are ranked argument frames — pick your own order and defend it with a clear test (was it enough on its own? did it make everything else possible? what changes if you remove it?).

Outcome A — Why the Korean War broke out in June 1950

A way to judge it: if the test is who made it possible, the answer is Stalin — Kim had wanted war for years, but only Soviet permission and weapons turned wanting into invading. If the test is the root cause, it is the 1945 division — without two rival states, there is nothing to invade.

Outcome B — Why the Korean War ended in stalemate rather than victory

• Chinese intervention — 200,000 troops reversed the UN advance and put reunification out of reach (1.4).
• The limits of limited war — Truman would not bomb China or use atomic weapons; winning MacArthur's way risked world war (1.5).
• The military balance — by 1951 neither side could break the other's dug-in lines at a price worth paying (1.6).
• The prisoner deadlock — the refusal to force POWs home stalled the talks for two years (1.6).
• New leaders — Eisenhower's election and Stalin's death finally made both sides prefer an armistice (1.6).
• A way to judge it: remove Chinese intervention and the UN probably unites Korea in 1950. Remove the POW dispute and you get the same armistice, just two years earlier. So the first explains the stalemate itself; the second only explains how long it lasted.

Outcome C — Why America failed to win in Vietnam

A way to judge it: the communists' willingness to outlast any punishment meant only destroying North Vietnam could have forced a win — and fear of China took that off the table from the start. Everything else explains how fast and how painfully America failed, not whether it would. Against the June 2025 statement: Tet fixed the timing of failure and made it public — but the causes were in place years before January 1968.

Outcome D — Why opposition to the war grew in the USA

• The draft and its unfairness — conscription reached into every family, and its bias against the poor and Black bred fury (2.6).
• Television — the first uncensored living-room war made the cost impossible to ignore (3.2).
• The credibility gap — Tet, the Pentagon Papers and Watergate proved the official optimism had been a lie (2.7, 3.2).
• My Lai and Kent State — the war's morality collapsed abroad, and its violence came home (2.8, 3.2).
• Cost and casualties — 58,000 dead and $170 billion, for aims fewer and fewer people believed in (3.4).
• A way to judge it: television carried every other factor into every home — it multiplied them all. But the single strongest cause is probably the draft: opposition was always fiercest among the people who might be sent.

Source workbench

Questions 1 and 2 are worth 16 of the 40 content marks. Two rules govern everything below. First: a limitation is not uselessness — a propaganda poster is weak evidence of events but excellent evidence of what its makers wanted people to believe. Always say what a source is useful for. Second: analyse content and provenance together — what the source is, who made it, when, and why shape everything it can tell you.

Quick self-test

Cover the answers and check yourself. Each answer names the section where the full detail lives.