The Slave Trade

By the end of this lesson, students will be able to:

• Account for the rise and development of the Atlantic slave trade as the labor solution to the Caribbean and Brazilian plantation economies and the demographic collapse of indigenous American populations (LO L; KC-1.3.IV.C).
• Identify and describe the principal European participants in the trade across three centuries: Portugal as the early supplier, the Dutch, English, and French entries in the seventeenth century, and the rise of the eighteenth century English and French dominance.
• Account for the role of African political authorities along the Senegambian, Bight of Benin, and Bight of Biafra coasts in supplying captives, and explain how the trade reshaped West African societies and politics.
• Account for the conditions of the Middle Passage and identify the specific evidence Olaudah Equiano's narrative and the Brookes stowage diagram provide about those conditions.
• Use Skill 4.A (Contextualization) to place the Atlantic slave trade within the broader Topic 1.8 framework of the Columbian Exchange and the rise of plantation agriculture.

The CED's framing of Topic 1.9 is built around a single key concept: KC-1.3.IV.C. Europeans expanded the trade in enslaved Africans in response to the rise of plantation agriculture in the Americas and the collapse of indigenous populations. The single-key-concept framing is unusual within Unit 1, but it reflects the precision the CED wants students to develop on causation: the Atlantic slave trade was not a free-standing institution; it was a labor solution to a problem produced by the events Topic 1.8 examined.

The trade had a long lead-in. Portuguese sugar plantations on the Atlantic islands (Madeira from the 1450s, Sao Tome from the 1490s) used enslaved African labor before Columbus's first voyage. After 1492 the Portuguese model crossed the Atlantic: the early Spanish Caribbean sugar plantations (Hispaniola, Cuba, Puerto Rico) and the Brazilian plantations (the first sugar mill in Brazil dates from 1516) drew on enslaved African labor as the indigenous Caribbean population collapsed. By 1600 the Atlantic plantation system was already operating at scale: roughly 300,000 enslaved Africans had been carried to the Americas over the course of the sixteenth century, with Brazil and the Caribbean as the principal destinations.

The seventeenth century saw the trade transform in scale and in institutional structure. The Dutch West India Company (chartered 1621) carried a substantial share of the seventeenth century trade, supplying Dutch and other European Caribbean plantations. The Royal African Company, chartered by King Charles II of England in 1672, gave a single English company a monopoly on the English slave trade until its monopoly was broken in 1698. The Asiento contract, the Spanish crown's grant of the right to supply enslaved Africans to the Spanish American colonies, passed from Portuguese to French to (after 1713) English contractors. The institutional infrastructure of the trade was the same chartered company structure that ran the Asian commerce of Topic 1.7: Atlantic slave-trading enterprises raised capital from urban merchant elites, distributed risk across many investors, and operated under state-granted monopolies.

The eighteenth century was the peak. England became the dominant slave-trading nation across the eighteenth century, accounting for roughly 3 million transported between 1690 and 1807; France was the second-largest trader, supplying its own Saint-Domingue, Martinique, and Guadeloupe plantations. The trade reached annual volumes above 80,000 in some years. The TransAtlantic Slave Trade Database, the most comprehensive scholarly compilation, documents roughly 36,000 transatlantic voyages between 1514 and 1866 that carried approximately 12.5 million enslaved Africans toward the Americas; about 10.7 million survived the Middle Passage. Brazil received the largest share (close to 5 million), followed by the British and French Caribbean (about 4.4 million), Spanish America (about 1.3 million), and the area that became the United States (about 388,000).

The supply side of the trade ran through the West African coast. African political authorities along the Senegambian, Bight of Benin, and Bight of Biafra coasts supplied captives, primarily produced through warfare with neighboring African polities. European traders did not, as a rule, raid the African interior themselves; they purchased captives from coastal African polities (Asante, Dahomey, the Kingdom of Kongo, the Oyo Empire) that conducted slave raids inland and brought captives to coastal forts. The relationship was reciprocal: African polities benefited commercially from the trade, especially through European firearms that gave them advantages in regional conflicts, and many West African states became more militarized and more state-centralized as a consequence of sustained Atlantic slave-trade participation. The trade also reshaped West African demography: the regions that exported enslaved Africans saw long-run population stagnation or decline, particularly affecting young adult males.

The Middle Passage — the transatlantic leg of the triangular trade — was the most lethal phase of the journey for enslaved Africans. Voyages typically lasted 60-90 days and were conducted under conditions of severe overcrowding, poor sanitation, inadequate food and water, and brutal discipline. Mortality during the Middle Passage averaged 12-15 percent across the period of the trade, with some voyages losing close to half their human cargo to disease (especially dysentery), suicide, or shipboard violence. The conditions of the Middle Passage were documented in detail in the late eighteenth century by British abolitionists, most famously through the Brookes stowage diagram of 1788, which became the most widely-circulated visual representation of the conditions of transport. Enslaved African voices on the Middle Passage are rarer in the surviving record but include Olaudah Equiano's narrative of 1789, one of the most influential abolitionist autobiographies of the period.

The trade had broad European consequences. It generated some of the largest commercial fortunes of the eighteenth century, especially in the slave-trading port cities of Liverpool, Bristol, Nantes, Bordeaux, and Amsterdam. It reshaped European urban consumption: cheap West Indian sugar, rum, and coffee, all produced by enslaved labor, became staples of European mass-market consumption from the late seventeenth century forward. It funded a portion of the eighteenth century European industrial accumulation that Topic 6 of Unit 6 examines. And it produced the cultural and intellectual phenomena — the eighteenth century European debates about slavery, the abolitionist movement that emerged in Britain in the 1780s, the Atlantic-wide constitutional crisis the trade produced after 1789 — that AP Euro Unit 4 returns to in detail.

Topic 1.9 is therefore best taught as a Causation lesson focused on the conditions Topic 1.8 produced. Students who can name the specific causal chain — plantation agriculture rises in the Caribbean and Brazil, indigenous demographic collapse makes local labor recruitment impossible, European slave-trading enterprises supply captives from African coasts, the Middle Passage carries them across the Atlantic — have the framework AP Euro Unit 1 expects. Skill 4.A (Contextualization) sits at the methodological center of the topic: students should be able to describe the broader Topic 1.8 context within which Topic 1.9's slave trade became the labor system of the Atlantic plantations.

Three sources, each documenting a distinct face of the Atlantic slave trade: the Middle Passage in an enslaved African's own words, the visual abolitionist documentation of slave-ship conditions, and the institutional infrastructure of state-chartered English slave-trading.

1. (Causation) Account for the specific causal chain that produced the Atlantic slave trade. What roles did the rise of plantation agriculture in the Americas (Topic 1.8) and the demographic collapse of indigenous populations (Topic 1.8) play, and how did each contribute? (KC-1.3.IV.C)
2. (Causation) Account for the role of African political authorities in supplying captives to the Atlantic trade. Why did European traders rely on coastal African polities rather than raid the interior themselves, and what consequences did sustained slave-trade participation have for West African states?
3. (Causation) Account for the institutional infrastructure of the trade across three centuries. How did the chartered joint-stock company form developed by the Asian commerce of Topic 1.7 carry over into the Atlantic slave trade?
4. (Causation) Compare Equiano's narrative of the Middle Passage with the Brookes stowage diagram. Both documents are abolitionist sources from the late eighteenth century, but they present the trade through different rhetorical means. How do the two sources complement each other as evidence?
5. (Causation) Account for the European economic and cultural consequences of the Atlantic slave trade. What roles did the trade play in producing eighteenth century commercial fortunes, in supporting the rise of European sugar consumption, and in funding eighteenth century European industrial accumulation?

Draft alignment — pending educator review. AP European History codes correspond to the official College Board Course and Exam Description (Effective Fall 2023, V.1). Statements below are paraphrased in the CountryReports voice; refer to the College Board's published CED for verbatim wording.