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NotesHistory (2028+) HLTopic 4.2
Unit 4 · Paper 1 · Conflict and displacement · Topic 4.2

IB History (2028+) HL — Indochina refugee crisis (1975–1990)

Topic 4.2 of IB History (first exams 2028) covers Indochina refugee crisis (1975–1990), which is part of Unit 4: Paper 1 · Conflict and displacement. Students explore key concepts including Indochina refugee crisis — conditions, Indochina refugee crisis — the response, Indochina refugee crisis — different groups' experiences. A strong understanding of indochina refugee crisis (1975–1990) is essential for IB History (2028+) HL exams and builds the foundation for connected topics across the syllabus.

Higher Level students should use this topic hub as a map: start with the shared sub-topics, then follow the HL-only extensions and exam-skill links where this topic asks for deeper analysis.

Exam technique guidePractice questions

Key concepts in Indochina refugee crisis (1975–1990)

Key Idea: In 1975, three Communist victories — Saigon (30 April), Phnom Penh (17 April) and Laos (December) — turned Indochina into the source of one of the century's biggest refugee crises. Over 3 million people fled Vietnam, Cambodia and Laos by 1990, driven by persecution and economic collapse. The world responded with refugee camps, resettlement programmes and a UN-brokered legal escape route. But 'Indochinese refugees' were never one group — the Hoa, Montagnard, Cham and Hmong each fled for their own specific reasons.

How this topic is tested (Paper 1)

This topic is a Paper 1 focused study. You'll be given 3-4 unseen sources (text and/or visual) about the Indochina refugee crisis and answer three fixed-format questions.

Q1 [6] Content — using TWO named sources, explain what their content tells you about the causes, response or experience of displacement. Quote or paraphrase specific detail, don't summarise vaguely. Q2 [6] Context — using ONE source, explain how its origin, purpose and audience shape what it shows (and what it leaves out). Q3 [12] Perspectives — using ALL the sources, compare how different viewpoints (victims, governments, outside observers) see the same events, and explain WHY they differ. Always end by directly answering the inquiry question.

Must-know facts from every sub-topic

MicroFocusKey facts to know cold
4.2.1Causes of displacementSaigon falls 30 Apr 1975; Phnom Penh falls 17 Apr 1975 (Khmer Rouge/Pol Pot); Laos communist Dec 1975 (Pathet Lao). Persecution: re-education camps in Vietnam; Cambodian genocide 1975-79 (1.5-2 million dead); targeted minorities — Hoa (Vietnam), Chams (Cambodia), Hmong (Laos), Montagnard (Vietnam). Economic collapse: collectivisation of farms/business from 1978 destroyed livelihoods, especially for the Hoa in Cholon.
4.2.2National and international responseRefugees fled by boat ('boat people') to first-asylum camps in Thailand, Malaysia, Hong Kong, Indonesia, Philippines (e.g. Pulau Bidong). USA resettled 800,000+ under the Refugee Act (1980). Vietnam initially pushed out the Hoa, later cooperated with UNHCR. Orderly Departure Program (ODP), 1979 — legal, safe departure by air instead of boats. Comprehensive Plan of Action (1989) — later screening/repatriation as 'economic migrant' claims rose.
4.2.3Experience of different groupsVietnamese boat people (1.5m+ fled 1975-90) — mainly ex-officials/soldiers fearing re-education. The Hoa — ethnic Chinese traders, 250,000+ fled from 1978 amid the nationalisation of private trade and rising Sino-Vietnamese tension (which culminated in the 1979 border war). The Montagnard — Vietnam's highland peoples, persecuted for wartime alliance with the US. Cambodians under the Khmer Rouge — Killing Fields, 1975-79. The Cham — Cambodia's Muslim minority, roughly half their population died. The Hmong — Laotian highlanders who fought in the CIA's 'Secret Army' under General Vang Pao, hunted as traitors after 1975; ~10% of Laos's population eventually fled.
  • Push factors (4.2.1) — combat victory, persecution (camps, genocide, targeted minorities), economic collapse from collectivisation.
  • Response (4.2.2) — first asylum (regional camps) then resettlement (USA, Australia, France, Canada); UNHCR's ODP (1979) and CPA (1989).
  • Different experiences (4.2.3) — same crisis, different groups: ethnicity (Hoa, Cham), wartime alliance (Montagnard, Hmong), and class/politics (ex-officials, the educated) each explain a different push factor.

Worked exam question: Q3 Perspectives [12]

IB-style questionExamine[12 marks]

Examine how the perspectives of Sources A, B and C can be used to answer the inquiry question: What were the conditions that led to mass displacement from Indochina, and how was it experienced by different groups?

🔒 Model answer plan

See the mark-by-mark plan — for / against / judgement, with marking guidance — in study mode.

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Worked exam question: Q1 Content [6]

IB-style questionExplain[6 marks]

Explain how the content of two sources can be used to answer the question: How was displacement experienced by different groups in the Indochina refugee crisis?

🔒 Model answer plan

See the mark-by-mark plan — for / against / judgement, with marking guidance — in study mode.

Unlock free for 7 days →
Important: Writing 'Vietnamese refugees fled hardship' loses marks fast. Examiners want you to name the Hoa, the Montagnard, the Cham or the Hmong specifically, and explain the exact reason each group was targeted. Precision about WHO and WHY is what separates a good answer from a vague one.

Which three countries fell to Communism in 1975, and when? Cambodia (Phnom Penh, 17 April 1975, Khmer Rouge), Vietnam (Saigon, 30 April 1975), and Laos (Pathet Lao, December 1975).

What was collectivisation, and why did it push people to flee? State seizure of private land, farms and businesses into government-run collectives, especially from 1978 in Vietnam. It collapsed production and destroyed livelihoods — hitting the Hoa traders in Cholon especially hard.

What is the difference between first asylum and resettlement? First asylum (Thailand, Malaysia, Hong Kong) was temporary shelter in regional camps. Resettlement (USA, Australia, France, Canada) meant a permanent new home. The USA alone resettled 800,000+ people under the 1980 Refugee Act.

What was the Orderly Departure Program, and why did it matter? A 1979 agreement between Vietnam and UNHCR letting people apply to leave legally by air instead of risking dangerous boat journeys — a direct response to the rising boat-people death toll.

Why were the Hmong specifically targeted by the Pathet Lao? The CIA had recruited and armed tens of thousands of Hmong as a 'Secret Army' against the Pathet Lao during the war. After 1975 they were treated as traitors for this wartime alliance, not for their ethnicity alone.

Why are the Cham historically significant in this topic? Cambodia's Muslim minority, the Cham were singled out by the Khmer Rouge for their religion and language — roughly half their population died, a higher proportional death rate than Cambodians as a whole.

1. Know your three dates: Phnom Penh (17 Apr 1975), Saigon (30 Apr 1975), Laos (Dec 1975). 2. Separate causes (persecution + economic collapse) from response (camps, resettlement, ODP) from experience (name the specific group). 3. For Q3, always explain WHY perspectives differ — origin, purpose, audience — never just list the differences. 4. Never write 'refugees' as one blob: name the Hoa, Montagnard, Cham or Hmong and their specific reason for fleeing.

What you'll learn in Topic 4.2

  • 4.2.1 Indochina refugee crisis — conditions
  • 4.2.2 Indochina refugee crisis — the response
  • 4.2.3 Indochina refugee crisis — different groups' experiences
Suggested study order: Read the notes for each sub-topic below → test yourself with flashcards → attempt practice questions → review exam technique.

Study resources — 4.2 Indochina refugee crisis (1975–1990)

4.2.1

Indochina refugee crisis — conditions

Notes
4.2.2

Indochina refugee crisis — the response

Notes
4.2.3

Indochina refugee crisis — different groups' experiences

Notes

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Topic 4.2 Indochina refugee crisis (1975–1990) forms a core part of Unit 4: Paper 1 · Conflict and displacement in IB History (2028+) HL. Mastering these concepts will strengthen your understanding of connected topics across the syllabus and prepare you for exam questions that require analysis, evaluation, and real-world application.

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