John Samuel Harpham, "Intellectual Origins of American Slavery: English Ideas in the Early Modern Atlantic World" (Harvard UP, 2025)

The period from 1550 to 1700 was critical in the development of slavery across the English Atlantic world. During this time, English discourse about slavery revolved around one central question: How could free persons be made into slaves? John Samuel Harpham shows that English authors found answers to this question in a tradition of ideas that stretched back to the ancient world, where they were most powerfully expressed in Roman law. These ideas, in turn, became the basis for the earliest defenses of American slavery. The Roman tradition had located the main source of slavery in war: enslavement was the common fate of captives who otherwise faced execution. In early modern England, this account was incorporated into studies of the common law and influential natural rights theories by the likes of Hugo Grotius and John Locke. When Europeans started to publish firsthand accounts of Africa in the sixteenth century, these reports were thus received into a culture saturated with Roman ideas. Over time, English observers started to assert that the common customs of enslavement among the nations of Africa fit within the Roman model. Englishmen had initially expressed reluctance to take part in the Atlantic slave trade. But once assured that the slave trade could be traced back to customs they understood to be legitimate, they proved keen to profit from it.

An eloquent account of the moral logic that propelled the development of an immoral institution, John Samuel Harpham's The Intellectual Origins of American Slavery (Harvard University Press, 2025) reveals the power of an overlooked tradition of ideas in the history of human bondage.

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