The Real Human Cost: Indigenous Peoples & the Origins of the Atlantic Slave Trade

The Age of Exploration

Chapter 9 · The Real Human Cost: Indigenous Peoples & the Origins of the Atlantic Slave Trade

Earlier chapters mentioned this subject several times and deferred it to here: the encomienda (Chapter 6), the Banda Islands (Chapter 7), the first Africans at Jamestown (Chapter 8). This chapter looks at two connected human costs of the period, the collapse of indigenous populations in the Americas and the Atlantic slave trade. The sources are three reference articles. The figures are among the most disputed in the course, so the chapter gives ranges, says which are estimates and does not reduce a human catastrophe to a single number.

Indigenous Populations of the Americas

Scholars have debated the population before 1492 extensively. Estimates range from as low as 8 million to as high as 100 million, though "by the end of the 20th century, many scholars tended toward an estimate of around 50 million people."

Estimate	Figure
Denevan (1992)	Approximately 53.9 million
Dobyns (1966)	90 to 112 million, considered high
Recent studies	Mostly between 45 and 60 million

A Very Wide Range The range of 8 to 100 million spans more than a factor of ten, and the source describes the debate as extensive. The estimates are reconstructions, since no census of the whole continent exists, and I did not find how any of them were made. I use "about 50 million" only as the source's own summary of a trend among scholars, not as a fact.

Causes of the Decline

Disease

"50-80 percent of the population died from waves of diseases brought by Europeans to places such as Mexico in the 16th century." Smallpox, influenza and pneumonic plague devastated populations lacking immunity.

Violence and Enslavement

Direct warfare, forced removal, enslavement and massacres contributed significantly to population loss.

Social Disruption

General societal collapse from colonization disrupted food systems and social structures.

The source gives one regional example: Mexico's population dropping to roughly one million by the late sixteenth century from an estimated 17.2 million in 1492.

A Precise Figure With a Large Uncertainty "17.2 million" looks exact but is an estimate, and the source presents it as one. The drop is more than tenfold on these figures, and I did not check how either end was derived.

A Debate About Causes Historians dispute the primary cause. The source says traditional scholars emphasize disease as incidental, while modern scholars argue deliberate European actions constituted genocide. It says the evidence supports both factors' importance and their relative weight remains contested. Chapter 6 gave the same disagreement for the encomienda. I do not settle it here, and I note that the two sides are not mutually exclusive.

Bartolomé de las Casas

Las Casas (1484 to 1566) was a Spanish clergyman who became a prominent advocate for indigenous peoples. Initially an encomendero, he underwent a change of conscience around 1514 after contemplating biblical passages about injustice. He renounced his slaves and his encomienda and spent the remaining fifty years of his life fighting the exploitation.

He influenced the New Laws (1542), which the source says abolished Indian slavery.
He served as Bishop of Chiapas and official Protector of the Indians.
In the Valladolid debate (1550 to 1551) against Juan Ginés de Sepúlveda he argued that indigenous peoples were fully human and deserved peaceful treatment.
His A Short Account of the Destruction of the Indies (1552) documented colonial atrocities.

Two Descriptions of the New Laws Chapter 6 said the New Laws attempted regulation and limited grants to two generations. This source says they abolished Indian slavery. The two statements can both be true, and I did not check the laws' text or how far either provision was enforced.

A Contested Witness The source says modern scholarship acknowledges his general depiction of colonial violence as historically accurate, though debates continue about his specific population figures and about his earlier, later-regretted suggestions about African slavery as an alternative labour source. That last point links to the next section, and I do not develop it.

The Atlantic Slave Trade

The trade began in the fifteenth century. Portuguese mariners initiated direct contact, and in 1444 "six caravels belonging to a consortium of seamen and merchants docked in Lagos with a cargo of 235 enslaved men, women, and children." It expanded dramatically after 1500 and peaked in the eighteenth century, before abolition efforts began in the early 1800s.

Measure	What the source says
Loaded onto slave ships for the Americas	Approximately 12.75 million Africans, by scholars' estimates.
Deaths during ocean transport	Up to 2 million.
Enslaved but remaining on the continent	An additional 8 million.
Main destinations	Brazil and the Caribbean colonies received the majority.
Trading nations	Portugal dominated at first, followed by Britain, Spain, France, the Netherlands, the United States and Denmark.

Estimates and Phrasing The source says "approximately" and "up to," and describes the figures as scholars' estimates. I did not find how they are derived or how far they differ between studies. Note also that these are people, and the figures cannot record what each person went through.

African Participation

The source says "Europeans usually bought enslaved people who had been captured in endemic warfare between African states." African merchants and kingdoms controlled coastal trading posts and profited from commerce, though the historian Anne Bailey notes that Africans lacked influence over European capital systems and plantation infrastructure. I did not find how large a role different kingdoms played, or the reasoning behind Bailey's point.

Connections Across the Course Chapter 2 introduced the Portuguese along the African coast under Prince Henry, who died in 1460, so the 1444 cargo falls within his lifetime. The source does not link him to it, and I do not. Chapter 8 recorded the first documented Africans in English North America in 1619. The Atlantic trade the source describes, with Brazil and the Caribbean receiving the majority, explains why the Jamestown arrival is described only as "documented."

Abolition

Britain prohibited the slave trade in 1807, though illegal trafficking continued into the 1860s. UK History 9 mentions the same 1807 date.

What I Did Not Verify I did not find the Middle Passage's conditions, the trade's economics, the role of the Banda Islands and the VOC's slave trade from Chapter 7, the Taíno of Hispaniola, or the experiences of the enslaved and of indigenous peoples in their own words. Any figure in this chapter should be treated as a range, and none of them counts the enslaved or the dead by name.

Hands-On Exercises

Exercise 1

Set out the causes of indigenous population decline that the chapter names, and explain why the range of pre-contact estimates matters for the size of the decline.

→ Solution

Exercise 2

A student writes "12.75 million Africans were enslaved by the Atlantic trade." Use the chapter to qualify it.

→ Solution

Exercise 3

Explain why Las Casas is described as a contested witness, and how you would use his work carefully.

→ Solution

Quick Reference

Pre-contact population: estimates from 8 to 100 million; many scholars near 50 million; Denevan 53.9 million
Decline: disease (50 to 80 percent in places such as Mexico), violence, enslavement, social disruption; Mexico about 17.2 million to about one million (estimates)
Debate: disease as incidental against deliberate action as genocide; relative weight contested
Las Casas: 1484 to 1566; change of conscience about 1514; Valladolid debate 1550 to 1551; 1552 Short Account
Atlantic trade: began with 235 people at Lagos in 1444; about 12.75 million loaded; up to 2 million died in transit; peak in the 18th century; Britain prohibited it in 1807
Not covered: conditions of the Middle Passage, the Taíno, first-person accounts