Reasons Africans Were Enslaved — By Region & Year

BlackHistoryData.com · Volume 1 · Chapter 02

“An African Anywhere is an African Everywhere” · By Furqan Shabazz Mujahideen

Critical context: Before European demand transformed the slave trade, internal African slavery existed on a small, mostly contained scale. It was not racial and was often temporary. European commercial demand after 1441 fundamentally changed and vastly expanded every one of these reasons — weaponizing them, scaling them up, and making them permanent and hereditary. The reasons below operated simultaneously across all regions throughout the trade period (1441–1867), though their relative importance varied by place and era.

Master List — All Documented Reasons Across All Regions

#	Reason	Type	Approx. % of Total Enslaved	Active Period	Notes
PRIMARY CAUSES (~85–90% of all enslaved people)
1	Warfare & Military Conquest	WAR	~60–70%	1441–1867	By far the single largest cause. Defeated enemies in wars were enslaved. European demand deliberately financed and instigated wars between African kingdoms to generate captives. By the 18th century, wars were being fought specifically to produce slaves for sale.
2	Kidnapping & Raiding (individual or village)	KIDNAP	~15–20%	1441–1867	In the 18th century alone, 70% of Africans trafficked in the transatlantic slave trade were free people snatched from their homes and communities. Professional kidnappers traveled inland specifically to abduct people from villages.
SECONDARY CAUSES (~8–12% of all enslaved people)
3	Debt & Pawnship	DEBT	~5–10%	Pre-1441–1867	Individuals or family members used as collateral for unpaid debts. If debts were not repaid they became permanently enslaved. Especially dominant in Bight of Biafra (Cross River area, Nigeria). A child in Angola named Nanga was pawned by his own mother in 1840s to free her brother who had been sold for adultery.
4	Judicial Punishment for Crimes	CRIME	~3–5%	Pre-1441–1867	Chiefs and kings sold criminals into slavery as a legal punishment. As European demand grew, many rulers deliberately expanded what counted as a crime so more people could be enslaved for profit. Almost any offense could be reclassified as punishable by enslavement.
5	Tribute Payment to Dominant Kingdom	TRIBUTE	~2–4%	1600s–1830s	Weaker kingdoms paid enslaved people as tribute to dominant powers to avoid war. Example: Dahomey paid slaves, cloth, and cowries to the Oyo Empire from the early 1700s until 1823.
ADDITIONAL DOCUMENTED CAUSES (~3–7% of all enslaved people)
6	Famine & Starvation — Voluntary Bondage	FAMINE	~1–3%	Pre-1441–1867	During famines, desperate families gave themselves or their children into bondage in exchange for food and protection — similar to European serfdom. Fear of stronger enemies could also cause a tribe to submit to bondage in exchange for military protection.
7	Parents Selling Children	POVERTY	~1–2%	Pre-1441–1867	Documented in multiple regions — extreme poverty drove parents to sell children. Often framed as giving a child a “better life” or as temporary arrangement that became permanent once the child entered the trade network.
8	Witchcraft Accusation	WITCHCRAFT	~1–2%	Pre-1441–1867	Anyone accused of witchcraft — causing illness, death, or misfortune — could be expelled from community or sold into slavery. Victims were often the elderly, disabled, albinos, or anyone considered different. As European demand grew, false witchcraft accusations became a way to eliminate enemies or rivals by selling them.
9	Adultery	ADULTERY	~1%	Pre-1441–1867	Documented specifically in West-Central Africa (Angola/Congo region). A person could be enslaved for committing adultery — and their family members could also be enslaved or pawned as a consequence. Documented in specific cases from Angola in the 1840s.
10	Political Exile & Power Struggles	EXILE	~1%	1500s–1867	Losing sides in royal succession disputes, palace coups, or political rivalries were enslaved and sold rather than executed. Rivals of kings and chiefs were eliminated by selling them to European traders — removing them from the country permanently.
11	European Direct Coastal Raiding	EUROPEAN RAID	~1–2%	1441–1600s	Early Portuguese and Spanish voyagers directly kidnapped Africans from coastal areas before a stable trading network was established. The very first documented Atlantic slave raid (1441) kidnapped a Moorish couple directly from the Mauritanian coast. This method became less common as the organized trade system developed.
12	Manipulation of Justice System by Kings	JUDICIAL MANIPULATION	~1–2%	1700s–1867	Kings in Dahomey and Asante deliberately redefined their legal systems so almost any crime could be punished by enslavement — or by death with the enslavement of the criminal’s wife and children — or by outrageously high fines that, if unpaid, resulted in the whole family being sold.
13	Inheritance / Born into Slavery	HEREDITARY	~2–3% (within Africa)	Pre-1441–1867	Children born to enslaved mothers were automatically enslaved in many African societies — the same principle later adopted by American slaveholders. These people were sometimes sold into the transatlantic trade when domestic demand was low.
14	Surrendering During Famine for Protection	PROTECTION	~<1%	Pre-1441–1800s	Entire communities facing crop failure or enemy threat could voluntarily submit to a stronger group in exchange for food and military protection, effectively entering bondage. This was similar to medieval European serfdom and could become permanent.

Breakdown by Region — Dominant Reasons & Key Documented Events with Years

WEST AFRICA

Senegambia · Sierra Leone · Windward Coast · Gold Coast · Bight of Benin · Bight of Biafra | ~70–75% of all enslaved people

Reason	Type	Specific Events & Years	Peoples Affected
Fulani Jihad Wars	WAR / RELIGION	Futa Toro jihad: 1690s; Futa Jallon jihad: 1727–1750s; Sokoto Caliphate jihad founded by Usman dan Fodio: 1804 — dissolved by British 1903. These wars enslaved hundreds of thousands of non-Muslim and Muslim Africans across Senegambia, Guinea, northern Nigeria, Cameroon.	Wolof, Serer, Mandinka, Hausa, Nupe, Tiv, Yoruba, Chamba
Mandinka / Dyula trader raids	KIDNAP / TRADE	Active from at least 1400s through 1800s. Professional Mande-speaking traders traveled hundreds of miles inland to kidnap and purchase captives, marching them to coastal forts.	Temne, Mende, Kisi, Limba, Susu, interior peoples
Asante Empire wars of expansion	WAR	Asante Kingdom formed 1670–1701 under Osei Tutu. Major slave-producing wars: Asante-Denkyira War 1699–1701; Asante-Akyem Wars 1717, 1742; wars with Fante 1806–1807, 1811, 1814–1816. British took Gold Coast control from Asante 1817. Captives sold through Cape Coast Castle and Elmina.	Akan subgroups, Ga, Ewe, Fante, Denkyira, Akyem
Kingdom of Dahomey annual slave raids	ORGANIZED RAIDS	Dahomey established 1600s; became dominant slave-raiding state 1720s. Conquered Allada 1724, Whydah 1727. Annual Customs (Xwetanu) raids: ~1730–1852. King Ghezo (reigned 1818–1858) massively expanded raids on Yoruba after breaking from Oyo in 1823. British naval blockade forced treaty ending slave export January 1852.	Yoruba, Ewe, Mahi, Fon subgroups, neighboring peoples
Oyo Empire wars & collapse	WAR / COLLAPSE	Oyo Empire active c.1300–1836. Oyo sold war captives for over 300 years. Internal rebellion began 1817; empire fell to Fulani forces 1835–1836. After collapse, Oyo (Yoruba) people themselves became mass victims — hundreds of thousands enslaved in the 1820s–1850s. From 1625–1700 alone the Bight of Benin exported over 175,000 people.	Yoruba, Nupe, Bariba, Ewe
Aro Confederacy inland kidnapping network	ORGANIZED KIDNAP	Aro Confederacy of Igboland active 1690–1902. Ran vast inland slave-raiding network across southeastern Nigeria. Sold over 850,000 slaves through Calabar port route; ~85% came from Igboland. The Aro used fake oracle pronouncements to condemn people to enslavement.	Igbo, Ibibio, Efik, Ijaw, neighboring peoples
Debt / pawnship (Bight of Biafra)	DEBT	Especially dominant in Cross River area of southeastern Nigeria throughout the trade period. Historians estimate debt was the majority driver of enslavement specifically in this area. Active throughout 1600s–1860s.	Igbo, Ibibio, Efik
Judicial punishment / crime	CRIME	Documented across all West African kingdoms throughout the trade. Kings of Dahomey and Asante specifically expanded criminal codes in the 1700s–1800s so that any crime could result in enslavement of offender and their entire family.	All West African peoples under monarchical rule
Witchcraft accusation	WITCHCRAFT	Documented throughout West Africa from pre-1441 through the 1800s. Individuals accused of causing illness, death, or crop failure through witchcraft could be expelled and sold. As European demand rose, false accusations became a convenient way to sell rivals.	All West African peoples; especially elderly, disabled, albinos
Tribute payment to dominant kingdoms	TRIBUTE	Dahomey paid slaves as tribute to Oyo Empire: early 1700s–1823. Kingdom of Whydah paid tribute to both Oyo and Dahomey before being conquered 1727. Smaller Gold Coast states paid enslaved people as tribute to Asante throughout 1700s–early 1800s.	Fon, Whydah, various Gold Coast peoples

WEST-CENTRAL AFRICA (Congo Basin & Angola)

Modern Angola, DR Congo, Republic of Congo, Gabon | ~39% of all enslaved people — single largest regional source

Reason	Type	Specific Events & Years	Peoples Affected
Portuguese military conquest of Ndongo Kingdom	EUROPEAN CONQUEST	Portuguese arrived Angola coast 1483. Full military campaign against Ndongo (Mbundu) Kingdom began 1575 with founding of Luanda. By 1612, Portuguese were enslaving ~10,000 Mbundu per year. Wars of conquest continued intermittently 1575–1680s.	Mbundu (Ambundu)
Kingdom of Kongo civil wars (Portuguese-fueled)	WAR / CIVIL WAR	Kingdom of Kongo destabilized by Portuguese-backed factions from 1500s. Major civil war: Battle of Mbwila 1665 — Portuguese and Imbangala defeated Kongo, killing the king and enslaving thousands of nobles and soldiers. Kongo never recovered. Mass enslavement of Bakongo people continued 1665–1836.	Bakongo
Imbangala warrior-raiders	PROFESSIONAL RAIDING	Imbangala (Jagas) emerged as professional slave-raiders c.1568. Built their entire economy on capturing and selling people. Primary suppliers for Portuguese traders in 17th–18th centuries. Active throughout 1568–1800s.	Bakongo, Mbundu, Chokwe, surrounding peoples
Debt / pawnship (Angola)	DEBT	Pawnship widely documented throughout 1700s–1860s. Individuals pawned family members as collateral for credit. If debts unpaid, pawns were sold into the trade. Documented case: Nanga (Angola, 1840s) pawned by his mother to free her brother who had been sold for adultery.	Mbundu, Ovimbundu, Bakongo
Adultery punishment	ADULTERY	Documented specifically in Angola/Congo region throughout 1700s–1840s. Adultery was punishable by banishment, enslavement, or death — and the offender’s family could also be enslaved or pawned as consequence.	Mbundu, Bakongo, Ovimbundu
Lunda Empire wars	WAR	Lunda Empire expanded aggressively from c.1665, raiding Chokwe and neighboring peoples. Wars produced captives sold through long trade chains to Portuguese coastal traders. Active 1665–1880s.	Chokwe, Luba, surrounding peoples
Loango Kingdom slave export	WAR / TRADE	Kingdom of Loango became a major slave-exporting port from c.1665. Loango rulers traded captives from interior wars with European ships. One of the most active ports in the entire trade from 1665–1830s.	Teke, Loango, interior Congo peoples

EAST AFRICA & INDIAN OCEAN WORLD

Modern Mozambique, Tanzania, Kenya, Madagascar | Primarily Arab / Indian Ocean trade; smaller % sent to Americas; highest mortality route

Reason	Type	Specific Events & Years	Peoples Affected
Yao trader-raider networks	RAIDS / TRADE	Yao traders built vast slave networks from Lake Nyasa (Malawi) to the Swahili coast from c.1700s. Became primary suppliers for Arab slave traders at Kilwa and Zanzibar. Most active 1800–1873 when Britain finally suppressed Zanzibar slave market.	Chewa, Nyanja, Maravi, Tumbuka
Omani Arab empire raids	WAR / COLONIAL	Omani Arabs seized Zanzibar 1698. By 1840 Zanzibar had become the world’s largest slave market exporting ~50,000 enslaved people per year. Arab slave trade from East Africa active from 7th century CE through British suppression 1873–1890s.	Makua, Yao, Zaramo, Zigua, Nyamwezi
Merina Kingdom wars (Madagascar)	WAR / CONQUEST	Merina Kingdom of Madagascar expanded aggressively from c.1787, conquering rival Malagasy kingdoms and enslaving defeated peoples. King Radama I banned export of enslaved people in 1819 after British pressure but internal slavery continued.	Betsileo, Sakalava, Bara, Antandroy
Portuguese prazo system (Mozambique)	COLONIAL / WAR	Portuguese prazo (land grant) system in Mozambique from c.1629. Portuguese-allied African warlords raided interior peoples for slaves. Most active 1629–1800s. Quelimane was the primary export port for enslaved Shona and neighboring peoples sent to Brazil.	Shona, Makua, Maravi, Chewa
Debt / tribute (East African coast)	DEBT / TRIBUTE	Smaller coastal communities paid enslaved people as tribute to Swahili and Arab trading cities throughout the 1600s–1800s. Also debt bondage documented among Nyamwezi and coastal Swahili communities.	Zaramo, Zigua, coastal Bantu peoples

NORTH AFRICA, SAHEL & MOROCCO

Modern Morocco, Mali, Niger, Chad, Sudan, Ethiopia | Primarily fed trans-Saharan Arab trade; Morocco also fed early Atlantic trade through Safi port

Reason	Type	Specific Events & Years	Peoples Affected
Moroccan invasion of Songhai Empire	WAR / CONQUEST	Moroccan Sultan Ahmad al-Mansur sent an army across the Sahara and destroyed the Songhai Empire at the Battle of Tondibi, 1591. The empire’s collapse destabilized the entire Sahel, producing mass enslavement of Songhai, Bambara, and Soninke peoples who were sold north to Marrakech.	Songhai, Zarma, Bambara, Soninke
Tuareg trans-Saharan caravan raids	RAIDS / TRADE	Tuareg caravan traders raided sub-Saharan peoples and transported captives north across the Sahara to Sijilmasa and Marrakech. Active from at least 7th century CE through early 1900s. Slave status was hereditary in Tuareg society.	Songhai, Zarma, Hausa, sub-Saharan peoples
Fulani jihad (Sokoto Caliphate)	WAR / RELIGION	Founded by Usman dan Fodio 1804. Rapidly conquered Hausa kingdoms of northern Nigeria, enslaving hundreds of thousands of Hausa, Nupe, Tiv, and others. At its height linked 30+ emirates and over 10 million people. Dissolved by British conquest 1903.	Hausa, Nupe, Tiv, Kanuri, Chamba
Portuguese raids on Mauritanian coast (Safi connection)	EUROPEAN RAID	First documented Atlantic slave raid: 1441, kidnapped a Moorish Muslim couple from Mauritanian coast. Portuguese built Arguin Fort, Mauritania, 1448. By 1465, Portugal transporting 1,000+ enslaved people per year from southern Morocco, Mauritania, and Senegambia through Safi. Safi under Portuguese occupation 1488–1541.	Amazigh (Berber), Moorish Muslims, Wolof, Mandinka
Marrakech slave market — trans-Saharan route terminus	TRADE / WAR	Marrakech was the northern terminus of the Timbuktu–Marrakech slave route from at least the 7th century. Sultan Ismail ibn Sharif (reigned 1672–1727) maintained a slave army of tens of thousands of Black Africans, replenished annually. Slave market formally suppressed 1912; clandestine trade continued to 1930s.	Songhai, Bambara, Soninke, Gnawa, Haratin
Nubian / Sudanese Arab raids	WAR / RAIDS	Arab and northern Sudanese slave raids into sub-Saharan Sudan active from 7th century CE through 1800s. The Khartoum-based Arab slavers were most active 1820–1880s, raiding Dinka, Nuer, and Nuba peoples for the Arab world’s slave market.	Dinka, Nuer, Nuba, Oromo

SOUTHERN AFRICA

Modern South Africa, Zimbabwe, Zambia, Botswana | Primarily Cape Colony Dutch/British system & Delagoa Bay route; limited direct transatlantic trade

Reason	Type	Specific Events & Years	Peoples Affected
Dutch Cape Colony forced labor & conquest	COLONIAL CONQUEST	Dutch East India Company (VOC) established Cape Colony 1652. First enslaved people arrived at the Cape 28 March 1658 on the Amersfoort — 170 survivors of 250 captured from a Portuguese slaver. Khoikhoi communities near Table Valley disintegrated within decades. Dutch raided San and Khoikhoi for forced labor throughout 1652–1795.	Khoikhoi, San, later Xhosa
Boer frontier wars & inboekstelsel	WAR / LEGAL	After formal British abolition of slavery (1834), Boer settlers used “inboekstelsel” — a legal apprenticeship system — to continue enslaving children of Black Africans captured in frontier wars. Active especially in 1836–1870s in the Transvaal and Orange Free State.	Ndebele, Sotho, Tswana, San
Delagoa Bay slave raids (Zulu / European)	WAR / RAIDS	In the 1820s, Zulu amabutho joined European raiders seizing women and children near Delagoa Bay (present-day Maputo, Mozambique), where French ships exported slaves. Delagoa Bay was an active slave export point primarily 1780s–1830s.	Tsonga, Zulu neighbors, Ndwandwe
Portuguese Zambezi prazo raids	COLONIAL / WAR	Portuguese-allied prazo (estate) warlords raided Shona and Lozi peoples along the Zambezi River from c.1629 onward. Captives sent east to Quelimane and then to Brazil. Most active 1700s–1850s.	Shona, Lozi, Chewa

Sources: Trans-Atlantic Slave Trade Database (SlaveVoyages.org) · Equal Justice Initiative — Transatlantic Slave Trade Report · Slavery & Remembrance (slaveryandremembrance.org) · Understanding Slavery Initiative · PortCities Bristol · Bill of Rights Institute · Cambridge University Press — Atlantic Slave Trade from West Central Africa, 1780–1867 (Domingues da Silva) · Britannica — Slave Trade, Dahomey, Asante, Oyo, Sokoto Caliphate · South African History Online · Candour Substack — 9 African Empires Involved in Slave Trade · TimeMaps — West Africa 1789 · Wikipedia — Dahomey raids on Yoruba, History of Kingdom of Dahomey, Aro Confederacy · Lumenlearning — West Africa and the Role of Slavery · Goodreads/Graeber — Debt: The First 5,000 Years. Percentages are historian-consensus estimates. Individual years are documented historical events, not estimates.