Every pre-colonial African state you study for Paper 3 eventually declined. The examiner wants you to explain why a strong state weakens.
The concept to use: That is not a failure of the topic — it is the whole point. Use the concept of cause and consequence.
We will anchor this micro on the Kingdom of Kongo (a Central African kingdom that dominated the lower Congo river from around 1400), because its decline is the best-documented case and shows every reason on the syllabus at once. We will also compare it briefly to Ashanti and the Swahili city-states, so you can argue with more than one example.
Four reasons for decline — memorise this list: 1) Opposition, resistance and civil wars (internal splits) 2) Foreign challenges (rival powers, invasion) 3) Economic factors (trade shifting away, resources drying up) 4) The trade in enslaved peoples (destabilising society itself)
Real collapses are almost always combinations of these, not a single cause.
Start with opposition and civil war. Kongo's kings (the manikongo) ruled a kingdom held together by loyalty from provincial governors, not by a modern bureaucracy. When a king died, succession was never automatic — rival princes and provinces fought for the throne.
This came to a head in 1665. King António I led Kongo's army against the Portuguese at the Battle of Mbwila, hoping to push back Portuguese encroachment from the colony of Angola. He was killed and his army destroyed. With no clear heir, Kongo fractured into rival factions, each backing a different claimant to the throne — a civil war that dragged on for decades and never fully healed.
Cause and consequence: war abroad, war at home: Mbwila shows how a foreign challenge (Portuguese military pressure) directly triggered internal civil war (succession conflict). The two reasons for decline are rarely separate — a good essay shows how they feed each other.
Compare this with the Ashanti Empire in West Africa (from 1701). Ashanti also faced internal resistance — subject peoples like the Fante resented Ashanti control and repeatedly rebelled or allied with the British against Asantehene (the Ashanti king). Ashanti stayed strong far longer than Kongo, but the pattern is similar: a powerful centre, resentful provinces, and rebellion whenever the centre looked weak.
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The syllabus separates 'economic factors' from 'trade in enslaved peoples', but for Kongo they were the same story.
Kongo's wealth had always rested on trade
- Copper
- Ivory
- Cloth woven from raffia palm
- Later, the profits of dealing with Portuguese merchants at the coast
From the late 1400s, that trade increasingly meant one thing: selling captives to Portuguese slavers bound for the Americas. At first, Kongo's kings tried to control and limit this trade. King Afonso I (ruled 1509–1543) wrote furious letters to the Portuguese king complaining that unregulated slaving was 'depopulating' his kingdom, even as he depended on slave-trade taxes to fund his own government.
The trap: dependency on the very trade that destroyed you: Kongo's rulers needed the slave trade for guns, cloth and revenue — but the trade also fed war (captives were often taken in raids and succession conflicts), which weakened the kingdom that depended on the trade. It was a self-reinforcing spiral.
After the civil wars following 1665, this spiral accelerated. Rival Kongo factions started raiding each other's territory specifically to capture people to sell for guns and wealth — meaning the slave trade no longer just weakened Kongo from outside, it became a tool rival Kongo leaders used against each other. War produced captives; captives were sold for weapons; weapons fuelled more war.
- Population loss — millions taken from West-Central Africa over the Atlantic trade's centuries, draining farming and military manpower.
- Shift away from productive trade — merchants and rulers who once profited from copper, cloth or ivory found slaving more profitable, so agriculture and craft production suffered.
- Currency and price disruption — European imports (cloth, guns, alcohol) flooded in, undercutting local production and making states dependent on foreign goods.
- Regional insecurity — the constant threat of raiding forced villages to fortify or scatter, disrupting normal farming and trade routes.
East Africa shows a different economic pressure. The Swahili city-states (Kilwa, Mombasa, Zanzibar) had grown rich on Indian Ocean trade — gold, ivory and later enslaved people moving to Arabia and the Persian Gulf. When Portuguese ships arrived after 1498 seeking to control that trade by force, Swahili cities lost their independent access to the ocean routes that had made them wealthy — an economic strangulation rather than Kongo's internal spiral.
Weighing the reasons in an essay: A top-band essay does not just list all four reasons. It weighs them — for Kongo, argue that civil war (from 1665) was the trigger, but the slave trade is what made the decline irreversible by destroying the population and social trust needed to rebuild.
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Decline is not the end of the story for Paper 3 — the syllabus also wants the impact of collapse.
Collapse is not emptiness: A kingdom falling apart does not mean the region becomes empty. It fragments into successor states, and life changes for the people who remain.
Impact on successor states
Kongo never disappeared in one stroke. It splintered into smaller rival polities (including the Kongo throne itself, still contested for generations) plus break-away provinces that had once answered to the manikongo — some, like Soyo, grew powerful in their own right by trading directly with Europeans instead of through the king.
Challenges for marginalized groups
Ordinary farmers and lower-status people suffered most: raided for captives, taxed by competing warlords, and offered no protection once central authority broke down. Women and children were especially vulnerable to slave raiding, since capturing them was often easier and they made up a large share of those enslaved.
Changing traditional practices
Kongo's elite had converted to Christianity under Afonso I, blending it with existing beliefs. As the kingdom fractured, religious authority fractured too — new prophetic movements emerged, most famously Dona Beatriz Kimpa Vita's Antonian movement (1704), which claimed Jesus was Kongolese and called for the capital to be reunified and rebuilt.
Commercial and social networks
Trade did not vanish — it reorganised. Coastal provinces like Soyo bypassed the weakened royal court entirely, trading straight with Portuguese and Dutch merchants. Older inland routes lost importance while new coastal, slave-trade-driven networks grew, permanently shifting where wealth and power sat.
Successors, Suffering, Spirituality, Shifted trade — the 4 S's of what collapse leaves behind.
Dona Beatriz's story is worth knowing in detail, because it shows how ordinary people responded to state collapse rather than just suffering it. She argued that Kongo's problems were spiritual as much as political, and she led a mass movement to reoccupy and rebuild the abandoned capital, São Salvador. The Kongo authorities, alarmed by her popularity, had her burned as a heretic in 1706 — but her movement shows how collapse created space for new leaders and new ideas, especially among people (in her case, a young woman) who had no path to power in the old system.
Argument: collapse was mainly self-inflicted
- Succession disputes were a pre-existing weakness, not caused by Europeans
- Kongo's own kings chose to profit from slaving before Portugal forced anything
- Rival Kongo factions raided each other — Africans enslaving Africans
Argument: collapse was mainly externally driven
- Portuguese military pressure (Mbwila) directly triggered the succession crisis
- Atlantic demand for captives created the incentive to raid in the first place
- European arms sales let rival factions fight far more destructively than before
You need both sides: Paper 3 essays reward students who can argue both directions and then reach a judgement — for example: 'internal rivalry made Kongo fragile, but the Atlantic slave trade is what turned a normal succession dispute into permanent collapse.'