Atlantic Triangular Trade: Europe–Africa–Americas (c.1502-1867)

1. First Spanish asiento license for slave imports

   Aug 1, 1518Labels: Asiento, Laurent de

   In August 1518, the Spanish Crown issued the first major asiento (a contract license) for importing enslaved Africans into Spain’s American colonies, granting Laurent de Gouvenot (also known as Laurent de Gorrevod) an eight-year monopoly. This helped formalize a regulated supply system because Spain lacked direct access to West African slave-trading networks. The asiento system became a key administrative tool tying imperial revenue to forced labor in the Americas.

   • Asiento

2. Portuguese colonization of Brazil begins

   Jan 1, 1530Labels: Portuguese Brazil, Sugar plantations

   Portuguese colonization of Brazil began in the early 1530s, laying the groundwork for plantation agriculture that would increasingly rely on enslaved African labor. Sugar production expanded along the Brazilian coast, creating large and growing demand for coerced workers. Brazil would later become the single largest destination for enslaved Africans in the Atlantic system.

   • Macmillan

3. Triangular trade system takes recognizable form

   Jan 1, 1600Labels: Triangular trade, West Africa

   By the late 1500s and early 1600s, a recurring three-legged pattern linked Europe, West Africa, and the Americas. European merchants shipped manufactured goods to African trading centers, where captives were sold into slavery and forced across the Atlantic in the Middle Passage. Plantation commodities such as sugar, tobacco, and later cotton were then shipped to Europe, tying consumer markets to plantation labor.

   • Britannica

4. First documented Africans arrive in Virginia

   Aug 25, 1619Labels: Point Comfort, English colonies

   In late August 1619, an English privateer brought “20 and odd” captive Africans to Point Comfort (in present-day Virginia), where they were traded to English colonists for provisions. While slavery as a fully defined legal institution developed over time in English America, this event marked an early and influential step in the growth of race-based forced labor in English colonies. It also shows how English colonies were pulled into wider Atlantic trafficking networks connected to Spanish and Portuguese shipping.

   • NPS

5. Dutch West India Company expands slave-trade power

   Aug 29, 1637Labels: Elmina Castle, Dutch West

   In August 1637, the Dutch West India Company captured Elmina Castle (on the Gold Coast, now Ghana) from the Portuguese. Elmina was a major fortified trading post that supported the sale and shipment of enslaved people as well as other commodities. Dutch control strengthened northern European competition for Atlantic trade and intensified conflicts over key coastal choke points.

   • DigitalKormantin
   • Elmina

6. Royal African Company chartered in England

   Jan 1, 1672Labels: Royal African, England

   In 1672, England founded the Royal African Company, a chartered company that held an English monopoly over trade along parts of the West African coast for a period. The company became a major institutional organizer of England’s slave-trading expansion, linking investors, shipping, forts, and colonial markets. This helped scale up British participation in the Atlantic trafficking system.

   • Britannica
   • NatArchives

7. Treaty of Utrecht grants Britain the Asiento

   May 1, 1713Labels: Treaty of, Asiento de

   In 1713, the Treaty of Utrecht (Peace of Utrecht) granted Britain the Asiento de Negros—a 30-year contract to supply enslaved Africans to Spanish America, later associated with the South Sea Company. The asiento mattered not only for slave sales but also because it opened legal footholds and trade access that encouraged smuggling and heightened imperial rivalry. It tightened the economic connections between European geopolitics and forced labor in the Americas.

   • Asiento
   • SouthSea

8. War of Jenkins’ Ear erupts amid trade tensions

   Oct 22, 1739Labels: War of, Britain Spain

   In 1739, Britain and Spain went to war in a conflict often linked to long-running disputes over commerce, maritime policing, and contraband in the Atlantic world. Tensions around the asiento system and enforcement actions at sea contributed to the broader deterioration in relations. The war shows how Atlantic trade—including slavery—was tied to naval power and imperial conflict.

   • JenkinsEar

9. French Convention abolishes slavery in colonies

   Feb 4, 1794Labels: French Convention, French colonies

   On 4 February 1794, France’s National Convention issued a decree abolishing slavery in French colonies, influenced by events in Saint-Domingue (Haiti) and wartime pressures. Implementation varied and later reversals occurred, but the decision marked a major political break in how a European state officially treated colonial slavery. It also signaled that enslaved resistance and revolutionary politics could reshape Atlantic labor systems.

   • CHNM
   • AbolitionDecree

10. United States bans importation of enslaved people

    Mar 2, 1807Labels: United States, Importation ban

    On 2 March 1807, the United States enacted a federal law to prohibit importing enslaved people, taking effect on 1 January 1808 (the earliest date allowed by the U.S. Constitution). The ban did not end slavery inside the country, and illegal trafficking continued, but it reduced legal transoceanic supply to U.S. ports. This encouraged greater reliance on internal slave markets and forced migration within the United States.

    • CongressGov
    • ABTrust

11. Britain abolishes its transatlantic slave trade

    Mar 25, 1807Labels: British Parliament, Slave Trade

    On 25 March 1807, the UK Parliament passed the Slave Trade Act, prohibiting the slave trade in the British Empire (though it did not immediately end slavery itself). This shifted British policy from being a leading carrier to formally outlawing participation in the trade. The act also set the stage for wider enforcement campaigns at sea.

    • UKParliament

12. Britain forms West Africa Squadron to suppress trade

    Jan 1, 1808Labels: West Africa, Britain

    In 1808, Britain established the West Africa Squadron to patrol the West African coast and intercept ships engaged in the Atlantic slave trade. Over time, suppression became a long-running naval and diplomatic campaign, uneven in effectiveness and shaped by international law and treaty rights. Even so, the squadron symbolized a major shift toward enforcement as a state policy tool in Atlantic waters.

    • WASquadron

13. Webster–Ashburton Treaty expands anti-slave-trade cooperation

    Aug 9, 1842Labels: Webster Ashburton, United States

    In 1842, the United States and Great Britain signed the Webster–Ashburton Treaty, which included cooperation to suppress the slave trade off the African coast. The treaty established a joint naval approach, reflecting growing pressure to coordinate enforcement across borders. This addressed a persistent problem: traffickers exploited national flags and jurisdiction gaps to avoid seizure.

    • Britannica

14. Aberdeen Act authorizes British seizures of Brazilian slavers

    Aug 9, 1845Labels: Aberdeen Act, British Parliament

    On 9 August 1845, the UK Parliament passed the Aberdeen Act, allowing British warships to board Brazilian ships and seize those involved in the slave trade. The act escalated Britain’s enforcement posture and increased pressure on Brazil, then a major destination for enslaved Africans. It also shows how abolition increasingly relied on coercive diplomacy and naval policing, not only moral persuasion.

    • AberdeenAct

15. Brazil’s Eusébio de Queirós Law outlaws trade

    Sep 4, 1850Labels: Eus bio, Brazil

    On 4 September 1850, Brazil enacted the Eusébio de Queirós Law (Law No. 581), strengthening enforcement against the transatlantic slave trade into the country. International pressure, especially from Britain, and increased naval interdiction contributed to the shift from weak or uneven enforcement to stronger suppression. While slavery in Brazil continued until 1888, the law marked a decisive step toward ending Brazil’s role as an importer in the Atlantic system.

    • Britannica
    • EusebioLaw

16. West Africa Squadron ends as Atlantic trade collapses

    Jan 1, 1867Labels: West Africa, Disbandment

    By 1867, the British West Africa Squadron was disbanded after decades of patrols aimed at suppressing the Atlantic slave trade. The end of the squadron reflects how a combination of abolition laws, treaties, naval enforcement, and shifting economic and political conditions narrowed the space for legal transoceanic trafficking. Although forced labor systems and illegal trafficking persisted in various forms, this marked a clear endpoint for one of the main state-led enforcement operations tied to the Atlantic triangular trade era.

    • WASquadron