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Bartolome de Las Casas in AP US History

Bartolome de Las Casas was a Spanish colonist turned Dominican friar who became the best-known European critic of Spain's treatment of Native Americans in the 1500s. After giving up his own encomienda (a royal grant of Native labor), he spent decades writing and lobbying against Indigenous enslavement and helped persuade the Spanish crown to issue the New Laws of 1542.

This definition is part of Fiveable's AP US History review, which also has guided practice questions.

Verified for the 2027 AP US History exam•Last updated November 2026•Fiveable Content Team

From encomendero on Hispaniola to Dominican critic

Las Casas arrived on Hispaniola in 1502 as an ordinary colonist. He took part in the conquest of Cuba and held an encomienda, which meant Native people were assigned to work for him in exchange for supposed protection and Christian instruction. In practice, the system worked people to death.

Around 1514 he gave up his encomienda and began preaching against the system. He later joined the Dominican order and spent the rest of his long life (he died in 1566) arguing at the Spanish court that Native peoples were rational human beings who had to be converted peacefully, without force.

His most famous book, A Short Account of the Destruction of the Indies, was written in 1542 and published in 1552. It described Spanish massacres and forced labor in graphic detail, and he wrote it to shock the crown into reform.

Valladolid, 1550: the Sepúlveda debate

In 1550-1551, the Spanish crown held a formal debate at Valladolid over how Native Americans should be treated. Juan Ginés de Sepúlveda drew on Aristotle's idea of "natural slaves" to argue that Native peoples were inferior and could justly be conquered. Las Casas argued that they were fully human, had their own legitimate societies, and could become Christians through persuasion. Neither side was officially declared the winner.

This is exactly what the Unit 1 (1491-1607) topic on cultural interactions between Europeans, Native Americans, and Africans describes. The course says extended contact pushed European political and religious leaders to argue over the proper treatment of non-Europeans. Las Casas and Sepúlveda are that argument with names attached.

The bigger point from that topic is that European views of Native Americans changed over time and weren't uniform. Both men were Catholic Spaniards, yet they used religion to reach opposite conclusions. Las Casas's personal shift from encomendero to critic is a ready-made example of "changing" perspectives.

The African slavery proposal Las Casas later regretted

Early in his reform career, Las Casas suggested that enslaved Africans could replace Native laborers in the Caribbean. He later regretted the idea and wrote that Africans were wronged in the same way Native peoples were.

This connects to the other half of the same cultural interactions topic, which covers evolving racial, cultural, and religious rationales for subjugating Africans and Native Americans. His early proposal shows how protecting one group could shift the burden onto another.

Don't overstate it, though. Las Casas did not start the Atlantic slave trade. Portugal was already shipping enslaved Africans before he ever proposed anything, and the trade grew because of demand for plantation labor. If an answer choice makes him its founder, it's wrong.

Answering the "this shift most directly reflected" stem

A multiple-choice set could use an excerpt from Las Casas's writings or another relevant stimulus, such as a description of his advocacy and the New Laws. A question might then ask what his change of heart, or Spain's change in policy, most directly reflected.

The right answer points to debate among Europeans over how to treat Native peoples, or to European attitudes shifting through extended contact. Wrong answers tend to claim things the evidence doesn't support, such as Spain ending forced labor entirely or Native resistance forcing the change. Colonists resisted the New Laws, and the crown backed off key parts within a few years, so the reform was limited.

In a short-answer response about early colonization, Las Casas can work as outside historical evidence when he's relevant to the prompt and the source provided. A strong response names a specific piece of evidence (the New Laws of 1542, the Valladolid debate, or his surrender of his encomienda) and ties it directly to the prompt's claim about changing or contested European views. He can also support a long essay about early colonization or Spanish-Native relations.

Las Casas wrote the evidence, rivals built the Black Legend

Las Casas is sometimes credited with creating the Black Legend, but that's off. He wrote to reform Spain's empire from the inside.

The Black Legend was the image of Spain as uniquely cruel that Protestant rivals, especially England and the Dutch, spread by translating and republishing his accounts. The English used it to cast their own colonization as more moral. On the exam, say his writings were used to fuel the Black Legend.

Where this sits in APUSH

Keep studying APUSH Unit 1