History › Early modern › Columbus's voyage to the Americas
Atlantic slave trade
c. 1501–1867; about 12.5 million people forced aboard ships· Event· Global
Well documentedSolid records, physical evidence or scientific consensus.
Over about 360 years, European traders shipped some 12.5 million enslaved Africans across the Atlantic to work on American plantations and mines.
See it on the History map →What happened
Portuguese, British, French, Spanish, Dutch and other traders bought captives, mostly taken in wars and raids by African states and dealers, for textiles, guns, metal goods and shells. On the 'Middle Passage', packed below decks for weeks, roughly 1 in 7 died; about 10.7 million survived the crossing. Nearly half went to Brazil and most others to the Caribbean, chiefly to grow sugar; about 400,000 reached what became the United States.
Why it matters
It built the plantation economies of the Americas, enriched European ports, devastated many West and Central African societies, and created the racial slavery whose legacy still shapes the Americas.
How we know
The SlaveVoyages database documents some 36,000 voyages from ship, customs and insurance records; survivor testimony such as Olaudah Equiano's 1789 autobiography; and archaeology of ports and plantations.
Still debated
How much the trade financed Britain's Industrial Revolution, and how deeply it reshaped African populations and politics, are still debated.
Connections (5)
▸Columbian Exchange carried the sugar cane that drove Atlantic slave tradeWell documented
The connection
Sugar cane, first domesticated in New Guinea, had spread through Asia and the Mediterranean and was already grown with enslaved African labor on Atlantic islands such as Madeira and São Tomé. Columbus took cane to Hispaniola in 1493. In Brazil and the Caribbean, sugar plantations demanded huge, brutal labor; with Native workers dying, planters imported enslaved Africans by the millions.
When and how
Atlantic islands from the 1400s; Hispaniola from 1493; Brazil from the mid-1500s; Barbados from the 1640s and Jamaica from the 1660s; Portuguese, Dutch, British and French planters.
How we know
Plantation records and voyage data show most enslaved Africans went to sugar colonies, and trade volumes rose with sugar output.
Debates and open questions
Historians debate how far sugar profits, versus racism and other crops like tobacco, coffee and cotton, drove the trade's growth.
▸Atlantic slave trade provoked Haitian RevolutionWell documented
The connection
Saint-Domingue's sugar plantations worked people so hard that deaths outpaced births, so planters kept importing Africans by the tens of thousands each year. By 1791 most enslaved people there had been born in Africa, some with military experience from wars there. This huge, brutalized majority, outnumbering whites roughly ten to one, rose in revolt.
When and how
Saint-Domingue, today's Haiti, through the 1700s; roughly 30,000 to 40,000 Africans arrived in some years of the late 1780s; the uprising began in August 1791.
How we know
Ship records in the Slave Voyages database, French colonial censuses and planters' accounts; historian John Thornton highlighted the African military background of many rebels.
Debates and open questions
How much African traditions, versus French revolutionary ideas, shaped the rebels' goals and organization is debated.
▸Atlantic slave trade was ended by Abolition of slaveryWell documented
The connection
The trade's horrors, documented by sailors, ship surgeons and survivors like Olaudah Equiano, became abolitionists' first target. A 1788 diagram of the slave ship Brooks, packed with captive Africans, shocked the British public. Campaigners attacked the trade first, believing slavery would wither without it. Britain banned it in 1807, and its navy then patrolled West Africa.
When and how
Britain from the 1780s, with Thomas Clarkson, William Wilberforce and Equiano; the US banned imports in 1808; the last known ship reached Cuba around 1867.
How we know
Parliamentary acts and debates, the Brooks print, Clarkson's interviews with sailors, and Royal Navy records of about 1,600 slave ships seized and some 150,000 people freed.
Debates and open questions
Eric Williams argued falling profits mattered more than morality; later historians such as Seymour Drescher found the trade still profitable when banned, giving campaigns and revolts more weight.
▸Atlantic slave trade created the slavery behind American Civil WarWell documented
The connection
The trade brought about 390,000 Africans to mainland North America. By 1860 their descendants numbered nearly 4 million enslaved people, many growing cotton. That human 'property,' valued above all US railroads and factories combined, shaped the South's economy and politics. The fight over whether slavery could spread west broke the Union.
When and how
From 1619 in Virginia to the US import ban of 1808; illegal landings continued, and the last known ship, the Clotilda, reached Alabama in 1860.
How we know
The Slave Voyages database, US censuses counting 3.95 million enslaved people in 1860, and Southern states' secession declarations naming slavery as their cause.
Debates and open questions
Historians debate how central slavery was to the whole US economy, including Northern banks, shippers and textile mills, not just the South's.
▸Atlantic slave trade supplied forced labor to European colonies in North AmericaWell documented
The connection
Enslaved Africans reached Virginia in 1619 and became the main labor force on tobacco, rice and indigo plantations in the Chesapeake and the Carolinas. Northern merchants and shippers also profited. Mainland North America received about 400,000 Africans directly, a small share of the total, but the enslaved population grew by natural increase to about 500,000 by 1775.
When and how
Point Comfort, Virginia, 1619, then Charleston, Newport and other ports; British and colonial traders, until the US banned imports in 1808.
How we know
Port records, the SlaveVoyages database, colonial censuses and plantation records; John Rolfe's letter records the 1619 arrival of 'twenty and odd' Africans.
Debates and open questions
Whether the first Africans in Virginia were treated as slaves or indentured servants is debated, as is when lifelong, race-based slavery became fixed in law.