For 300 years, the Atlantic slave trade made huge profits for European merchants, planters, and some African rulers. Then, in the space of a few decades either side of 1800, it stopped being worth doing.
This section asks a cause-and-consequence question: what changed in the economy to make slaving less attractive?
- Industrialisation and new technology — Britain's factories (from the 1760s onward) needed raw materials like cotton and palm oil far more than they needed enslaved labour on faraway plantations. Machines in Manchester made more money than muscles in the Caribbean.
- Rise of legitimate commerce in West Africa — palm oil, groundnuts, timber and ivory became newly profitable exports. African merchants who had sold captives could now sell produce instead, without losing income.
- Need for a labour force on African plantations — as demand for palm oil grew, some West African states (e.g. Dahomey, the Niger Delta) started keeping captives at home to work new plantations, rather than selling them across the Atlantic.
- Reduced productivity of slave labour — by the late 1700s, many Caribbean sugar colonies (especially the older British islands) had soil exhaustion and overproduction. Sugar prices fell, so buying more enslaved workers made less financial sense.
Put together, these four factors describe a slow economic squeeze: slaving stayed legal on paper for longer than it stayed profitable in practice. That timing matters for the essay debate below.
The economic argument in one line: Capitalism found a cheaper, safer way to make money from Africa — raw materials and wage-adjacent labour — so the old business model of selling human beings became less essential to European profit.
Case FOR 'economics ended it'
- Timing fits: Britain led both industrialisation AND abolition (1807)
- Palm oil exports from West Africa rose sharply after 1807, showing an alternative was ready
- Caribbean planters themselves complained profits were falling before abolition
Problems with 'economics ended it'
- The slave trade was still profitable in 1807 — it did not collapse on its own
- Brazil and Cuba's slave-based sugar economies boomed AFTER Britain abolished its trade
- If money were the only cause, Parliament would have waited for profits to hit zero, not legislated early
Use this for cause & consequence: Economic decline is a real, examinable cause — but it is a background condition that made abolition easier to pass, not the trigger that made Parliament act. Keep this distinction clear in essays.
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If economics alone does not explain 1807, what does? Historians point to a combination of ideas, people power, and law — reinforced later by colonial ambition.
1. Ideological factors
Enlightenment ideas about natural rights, and a religious revival (especially Quaker and Evangelical Christianity), spread the idea that owning another human being was morally wrong, not just economically debatable.
2. The abolitionist movement
Campaigners like Thomas Clarkson, Granville Sharp and William Wilberforce built Britain's first mass political campaign: petitions, boycotts of slave-grown sugar, and testimony from formerly enslaved people such as Olaudah Equiano.
3. Political and legal factors
Parliament passed the Slave Trade Act 1807, then the Slave Trade Act 1824, backed by the Royal Navy's West Africa Squadron patrolling the coast.
4. Expansion of European colonialism
From the 1880s, European powers justified taking direct control of African territory partly by claiming to be stamping out slavery and the slave trade — a moral cover for imperial conquest.
Ideas → Campaign → Law → Empire: four forces that turned a profitable trade into a banned one.
Notice the order matters. Ideas came first (from the 1770s), the mass campaign built through the 1780s–90s, the law followed in 1807, and the colonial justification came decades later, once the trade was already illegal.
1807 did not end slavery: The 1807 Act banned the trade — British ships transporting captives. It did not free people already enslaved in British colonies; that took the Slavery Abolition Act of 1833. Keep 'trade' and 'slavery itself' separate in your essays — students often blur them and lose marks.
| Act | Year | What it actually did |
|---|---|---|
| Slave Trade Act | 1807 | Banned British subjects and ships from the transatlantic slave trade |
| Slave Trade Act | 1824 | Made participating in the slave trade an act of piracy |
| Slavery Abolition Act | 1833 | Freed enslaved people in most of the British Empire (separate from the trade Acts) |
Enforcement was real but incomplete: The West Africa Squadron freed around 150,000 people from slave ships over the century, but illegal smuggling to Brazil and Cuba continued for decades — the law was a turning point, not an instant end.
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This is the heart of the Paper 3 skill: not just knowing the causes, but weighing them against each other to reach a judgement.
One influential argument (associated with the historian Eric Williams, though you don't need to name him) claims Britain abolished the trade mainly because it was becoming less profitable — a hard-headed economic decision dressed up in moral language.
A rival argument insists the humanitarian campaign was genuine and decisive — ordinary British people, especially women and religious groups, sacrificed convenience (boycotting sugar) for a cause with no direct benefit to themselves, which a purely economic model cannot explain.
- Evidence that favours the economic case — West Indian sugar profits were declining relative to other investments by the 1790s; Parliament acted just as 'legitimate commerce' alternatives were becoming viable in West Africa.
- Evidence that favours the ideological/campaign case — the campaign began in the 1780s while the trade was still highly profitable; over 300,000 people signed anti-slave-trade petitions in 1792, an extraordinary act of political mobilisation with no economic payoff for petitioners.
- Evidence that favours the political/legal case — without the 1807 and 1824 Acts and the Navy's patrols, moral opposition alone would not have stopped ships sailing; law converted sentiment into enforceable change.
- Evidence that favours the colonial case — 'anti-slavery' justifications for conquest appear mostly from the 1880s onward, decades after the trade was already illegal, suggesting this was a later add-on reason, not an original cause.
Avoid a single-cause answer: A strong Paper 3 essay never argues one factor alone 'caused' abolition. The strongest answers show how economic conditions made abolition possible while ideology and campaigning made it happen, with law making it permanent — and note colonialism came later, reusing the same language.
A worked mini-argument: Student Amara is planning an essay on 'To what extent was abolition driven by economics?' Her plan: paragraph 1 argues yes (declining profits, legitimate commerce); paragraph 2 argues the ideological/campaign case is stronger (petitions, timing before profits collapsed); judgement — economics explains timing and feasibility, but the abolitionist movement explains why it happened at all.