Key Idea: Between 1500 and 1900, the slave trade grew into one of history's largest forced migrations — about 12.5 million people taken across the Atlantic, plus hundreds of thousands more forced across the Indian Ocean from East Africa. It expanded because European and Middle Eastern demand met African political and military conditions that supplied captives. It reshaped African societies, economies and states, and it eventually collapsed under a mix of economic change, ideology, campaigning and law.
How this topic is tested
This is a Paper 3 HL regional-depth topic. You'll answer two essays, each an 'Evaluate' or 'To what extent do you agree...' question worth 15 marks.
There is no source booklet here — you bring the facts from memory. Each essay needs a clear thesis stated early, an argument FOR the claim with named evidence, an argument AGAINST it with named evidence, and a judgement that ranks the factors rather than just restating both sides. You do NOT need historiography (naming historians) to reach the top markband — specific facts, dates and names do the real work.
Must-know facts from every sub-topic
| Micro | Focus | Must-know names, dates, events |
|---|---|---|
| 10.3.1 | Why the trade grew | Atlantic (from 1500): c.12.5 million taken; maritime commerce (caravels), plantation agriculture (Brazil/Caribbean sugar), states like Dahomey and Asante built power on the trade, internal African wars supplied captives. East Africa (from late 1700s): old Swahili Coast–Indian Ocean trade; Sultanate of Oman took political control of coastal towns; Sultan Seyyid Said moved Oman's capital to Zanzibar in 1840, building an empire on cloves and enslaved labour; traders shifted east partly to dodge British patrols after 1807. |
| 10.3.2 | Impact on Africa and resistance | Social: broken kinship networks, fortified villages, constant insecurity. Economic: coastal middlemen (Dahomey, Asante, Bonny, Whydah) grew rich; inland regions lost labour and skills. Demographic: near-zero population growth in 18th-century West-Central Africa; roughly two-thirds of Atlantic captives were male, causing gender imbalance. Political: Dahomey and Asante expanded using firearms bought with trade profits. Resistance: day-to-day sabotage, rebellions (barracoons, slave forts, the Middle Passage), escape into maroon communities, and legal/political resistance such as Afonso I of Kongo petitioning Portugal in the early 1500s. |
| 10.3.3 | Decline and abolition | Economic causes: industrialisation (Britain, from the 1760s), rise of 'legitimate commerce' (palm oil, groundnuts), demand for captive labour on African plantations, falling Caribbean sugar productivity. Ideological/political causes: Enlightenment and religious (Quaker/Evangelical) ideas; campaigners Thomas Clarkson, Granville Sharp, William Wilberforce and Olaudah Equiano; 1792 petition of around 400,000 signatures. Law: Slave Trade Act 1807 (banned the trade, not slavery itself), Slave Trade Act 1824 (made it piracy), Slavery Abolition Act 1833 (freed enslaved people), West Africa Squadron patrols. Colonialism: from the 1880s, 'anti-slavery' language was reused to justify the Scramble for Africa. |
- Dahomey and Asante — West African kingdoms that expanded their power by controlling the slave trade and buying firearms with the profits.
- Seyyid Said — Omani sultan who moved his capital to Zanzibar in 1840, building a commercial empire on cloves and enslaved labour.
- Afonso I of Kongo — early-16th-century king who protested the slave trade's effects to Portugal, with limited success.
- Thomas Clarkson, William Wilberforce, Olaudah Equiano — key figures in Britain's abolitionist campaign.
- 1807 vs 1833 — the Slave Trade Act (1807) banned the trade; the Slavery Abolition Act (1833) freed enslaved people. Do not confuse the two dates.
Modelled exam question
To what extent do you agree that economic factors were the main reason for the expansion, and later the abolition, of the Atlantic slave trade?
Model answer plan
See the mark-by-mark plan — for / against / judgement, with marking guidance — in study mode.
Important: Do not write a one-sided essay that blames a single cause — 'just greed' for expansion, or 'just economics' for abolition. Examiners specifically penalise single-cause answers. Always show two or more interacting factors, and always finish with a ranked judgement, not a list of 'many reasons.'
What four factors explain the Atlantic trade's growth? Maritime commerce (better ships and navigation), plantation agriculture (sugar demand in Brazil/Caribbean), European demand meeting African state responses (e.g. Dahomey, Asante), and internal African warfare that produced captives.
Why did East Africa's slave trade explode after the late 1700s? The Sultanate of Oman extended political control over Swahili coastal towns, Seyyid Said moved Oman's capital to Zanzibar in 1840 and built a clove-plantation economy on enslaved labour, and traders partly relocated east to escape British naval patrols enforcing the 1807 Act.
Name the four categories of impact on Africa. Social (broken communities, insecurity), economic (coastal middlemen enriched, inland regions drained), demographic (stalled population growth, gender imbalance), and political (states like Dahomey and Asante expanding their power).
What forms did resistance take? Day-to-day resistance (sabotage, slow work, preserving culture in secret), open rebellion (in barracoons, forts, and aboard ships during the Middle Passage), escape into maroon communities, and legal/political resistance such as Afonso I of Kongo's protests to Portugal.
What's the difference between the 1807 and 1833 Acts? The 1807 Slave Trade Act banned British ships from carrying enslaved people — it ended the trade, not slavery. The 1833 Slavery Abolition Act actually freed enslaved people across most of the British Empire.
Was abolition driven mainly by economics or by ideology? Both mattered, but the timing favours ideology: the abolitionist campaign started in the 1780s, before profits had clearly fallen, and the 1792 petition gathered around 400,000 signatures with no economic benefit to signers. Economics made abolition survivable; the campaign made it happen.
1. Always name specific evidence — Seyyid Said, Dahomey, Asante, Afonso I of Kongo, Clarkson, Wilberforce, Equiano, 1807, 1824, 1833. 2. Keep 'end of the trade' (1807) separate from 'end of slavery' (1833) — this mix-up is the single most common error. 3. Every essay needs a thesis in your first paragraph and a ranked judgement in your last — never just list both sides and stop.