In 1975, three countries in Indochina — Vietnam, Cambodia and Laos — all fell to Communist forces within months of each other. For millions of people, that single year became the reason they had to leave everything behind.
This micro answers the inquiry question What were the conditions that led to mass displacement? using the Indochina crisis (1975-1990) as your Paper 1 example.
Three countries, one turning point: On 30 April 1975, Saigon fell to North Vietnamese and Viet Cong forces, ending the Vietnam War. Just weeks earlier, on 17 April, the Khmer Rouge had captured Phnom Penh, Cambodia's capital. In December 1975, the Communist Pathet Lao took full control of Laos. All three governments now answered to Communist parties allied with each other.
The fall of Saigon triggered the first wave of refugees. Around 130,000 South Vietnamese — many linked to the old government, the army, or the Americans — evacuated within days, often by helicopter or boat, fearing what a Communist government would do to them.
- Vietnam (30 April 1975) — Saigon falls; South Vietnam is absorbed into a unified Communist state.
- Cambodia (17 April 1975) — Khmer Rouge forces under Pol Pot capture Phnom Penh.
- Laos (December 1975) — the Pathet Lao abolish the monarchy and declare the Lao People's Democratic Republic.
How to read a source's content on this event: Content = what a source actually says. If a source is a refugee's diary entry describing helicopters leaving Saigon, its CONTENT tells you what the writer saw and felt on that day — useful evidence of the panic and urgency of the first evacuation wave.
It's easy to think the fighting simply stopped in 1975. It didn't — for the people now living under new governments, a different kind of danger was just beginning.
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Combat victory in 1975 did not bring peace for everyone. The new Communist governments moved quickly against anyone seen as a threat — and that fear became a huge driver of flight.
Re-education camps: In Vietnam, hundreds of thousands of former South Vietnamese soldiers, officials and 'class enemies' were sent to re-education camps. Some stayed only weeks; others were held for over a decade, doing forced labour with little food. Survivors' testimonies are among our most important Paper 1 sources for this theme.
In Cambodia, the persecution went much further than imprisonment. The Khmer Rouge emptied cities almost overnight, marching millions of people into the countryside to work on collective farms.
The Cambodian genocide: Under Pol Pot (1975-1979), the Khmer Rouge tried to build an agrarian utopia by force. Doctors, teachers, monks and anyone linked to the old regime or 'the West' were killed. Combined with starvation and overwork, an estimated 1.5-2 million Cambodians — about a quarter of the population — died. This is known as the Cambodian genocide.
Persecution didn't fall evenly. Several ethnic and religious minorities were singled out across the three countries.
| Group | Country | Why they were targeted |
|---|---|---|
| Hoa (ethnic Chinese) | Vietnam | Seen as a security risk as tensions rose with China, worsening after the 1979 border war; many owned businesses seized under collectivisation. |
| Chams | Cambodia | A Muslim minority; the Khmer Rouge banned their religion and language and killed them in disproportionate numbers. |
| Hmong | Laos | Many had fought for the US-backed 'Secret Army' during the war, so the new Pathet Lao government treated them as enemies. |
| Montagnard | Vietnam | Highland minority groups who had allied with US forces; faced reprisals from the new Communist government. |
How to read this source: testimony vs. official record: Imagine two sources: (1) a Hmong refugee's 1978 interview describing fleeing across the Mekong River, and (2) a 1976 Pathet Lao government report claiming 'reactionary elements' were being resettled peacefully. Their CONTENT directly conflicts — but their CONTEXT explains why: one is a personal account of persecution, the other is state propaganda designed to justify the government's actions.
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Fear of persecution wasn't the only reason people left. For many families, simply surviving became impossible under the new economic systems.
All three new governments moved fast to abolish private property and replace it with state control. Farms, factories, and shops that families had owned for generations were absorbed into government-run collectives.
Land and business seized
Private farms, factories and shops were nationalised or grouped into state-run collectives, especially from 1978 in Vietnam.
Production collapses
Without private incentives or experienced management, food and goods production fell sharply across all three countries.
Shortages and poverty spread
Rationing, food shortages and falling living standards hit ordinary families hardest, especially former traders and farmers.
Families choose to flee
With no legal way to run a business or farm independently, many decided leaving was the only path to a livelihood.
Seize it, starve it, flee it — collectivisation's chain reaction.
This hit Vietnam's Hoa community especially hard: many ran small businesses in cities like Cholon (Saigon's Chinese district), and collectivisation in 1978 wiped out their livelihoods almost overnight — one reason so many joined the 'boat people' leaving by sea.
Political/persecution factors
- Fear of re-education camps
- Khmer Rouge genocide in Cambodia
- Reprisals against Hmong who fought with the US
- Targeting of Hoa, Chams and Montagnard minorities
Economic factors
- Collectivisation of farms and businesses
- Collapse of production and trade
- Food shortages and rationing
- Loss of livelihood for traders and farmers
Using content to answer the inquiry question (Q1 [6]): For Q1, pick TWO sources and explain what their CONTENT tells you about conditions. Example: a 1979 photograph of an overcrowded boat leaving Vietnam shows the scale and desperation of economic flight; a memoir describing a family's shop being seized explains WHY people made that choice. Together, the two sources' content builds a fuller answer than either alone.
By the late 1970s, these three causes — combat victory, persecution, and economic collapse — had combined to push millions of people out of Indochina, most by land into Thailand or by sea across the South China Sea.