Episode Overview

Podcast: New Books Network
Episode: John Samuel Harpham, "Intellectual Origins of American Slavery: English Ideas in the Early Modern Atlantic World"
Host: Ryan Tripp
Guest: Professor John Samuel Harpham, University of Oklahoma
Date: January 9, 2026

This episode features an in-depth discussion with Professor John Samuel Harpham about his book, Intellectual Origins of American Slavery: English Ideas in the Early Modern Atlantic World (Harvard UP, 2025). The conversation explores how early modern English philosophical and legal traditions shaped the moral and intellectual frameworks that justified and explained American slavery. Harpham offers a nuanced examination of ideas—rather than solely economic or ideological forces—charting how concepts about freedom, human difference, and law intersected with the emergence of slavery in the Atlantic World.

Key Discussion Points and Insights

Personal and Academic Genesis of the Book

• Harpham traces the book's origins to his upbringing in New Orleans, a city "that was the hub of the antebellum domestic slave trade" ([02:43]). He was drawn to exploring how "the history of slavery and history of ideas" intersect—an area often neglected by political theory, which typically centers on the history of freedom rather than slavery.
• Quote:

  "That question is, how did what we now understand to be the most terrible wrong in the history of this nation first come to be seen not only as necessary or profitable, but as legitimate from a moral point of view?" — Professor Harpham ([05:33])

• The book deliberately investigates "intellectual origins" rather than "ideological," acknowledging the interplay of ideas and interests but pushing back against exclusive economic determinism.

Classical Roots: Aristotle, Roman Law, and the "Torrid Zone"

• Two principal traditions shaped early modern English ideas about slavery:
  • Aristotelian Natural Slavery: Some people are by nature slaves; inequality is natural ([08:08]).
  • Roman Law: All people are naturally free; slavery enters societies via custom and war.
• The "torrid zone" myth, originating with Aristotle and classical geographers, cast most of Africa as a barren, inhuman region—an idea crucial to European perceptions of Africans.
• Quote:

  "Aristotle believed that ancient Greece was within the most temperate zone... But to the south...there was a barren part of the world that ran along the equator where the heat rendered human life almost impossible...what Aristotle called the torrid zone." — Professor Harpham ([11:17])

Early Modern Political Thought: Grotius, Hobbes, Pufendorf

• Grotius, Hobbes, and Pufendorf rejected Aristotelian natural slavery and modeled their accounts on Roman law, emphasizing the natural freedom of all humans ([13:33]).
  • Grotius: Enslavement can come via war, crime, or consent—even entire peoples can consent to subordination.
  • Hobbes: Slavery arises from war outcomes; enslaved retain natural rights to resist.
  • Pufendorf: Root of slavery is agreement/compact; even captives in war must "agree" to their status.
• These philosophical stances reflected and rationalized broader societal and legal ideas about freedom and subjugation.

English Adaptations: Bodin, Locke, and Atlantic Practice

• Bodin stressed that the commonwealth meant a society where "all people were free...no slaves in France...nor in England" ([20:53]).
• Locke (subject of much scholarly debate) maintained the Roman model: all are free by nature, enslavement is just for unjust aggressors in war. Evidence suggests Locke sought alignment between his abstract ideas and the practice of contemporaneous slavery.
• Notably, early modern theorists often discussed slavery in abstract or classical terms, rarely referencing Atlantic slavery directly.

Justifications for Colonial Violence and Enslavement

• English polemicists used debates in Spain (Las Casas, the natural slave question) to distinguish their own colonial enterprise as less barbarous, avoiding Aristotelian arguments ([27:35]).
• However, in response to Native American resistance and violence (e.g., the 1622 Virginia massacre), English settlers reinterpreted the Roman law to justify enslavement as reprisal, running parallel to Spanish precedents.
• Quote:

  "...Along a different path...the English came to more or less similar conclusion as the Spanish...they were justified in attacking Native Americans, committing violence, and indeed enslaving them as well." — Professor Harpham ([31:22])

Africa as Commercial and Intellectual Focus

• Harpham advocates shifting the historical lens from American plantation societies to Africa itself, given its centrality to the Atlantic slave trade ([34:42]).
• He highlights sources like Richard Hakluyt’s Principal Navigations as critical for understanding English encounters and evolving ideas about African societies.
• Discussion of Prester John—a legendary Christian ruler in East Africa—demonstrates that not all English views of Africans were negative or uniform. The very capacity of Africans for commerce and "civility" shaped English justifications for trade and, ultimately, enslavement ([38:53–45:47]).

Evolution of Perceptions: Cartography, Civility, and War

• European travel narratives and cartographical work in the late 16th–17th centuries (e.g., by Leo Africanus, Richard Jobson) challenged the "torrid zone" legend, describing vibrant African polities ([46:23]).
• Roman law identified enslavement as an alternative to death for captives in war—a theme refracted in English narratives and perceptions of African customs ([51:29]).
• The notion that slavery equaled being "saved from death" further blurred distinctions between European and African practices, even as English writers maintained a passive self-image regarding their role in enslavement ([51:29]).

Early Critiques and Racialization: Baxter, Tryon, and Skin Color

• Social critics like Thomas Tryon, after witnessing conditions in Barbados, declared that Atlantic slavery had become "a fate worse than death," reversing old justifications ([57:36]).
• Examination of the "curse of Ham" and the search for the "causes of blackness" (e.g., George Best) represent the early emergence of racialized thinking ([63:59]).
• However, Harpham stresses that many 17th-century English theories of difference were hotly contested (climate, biblical curse, seminal impression), and discourses of blackness and slavery were not initially congruent ([72:07]).

Science, the Body, and the Rise of Racial Thought

• Theories such as "seminal impression" (Boyle, Royal Society) attempted to explain blackness as a physical departure from the "white norm," yet scientific consensus eluded English thinkers by 1700 ([76:33]).
• Notions of black beauty (echoing figures like the Queen of Sheba) complicate the universalization of negative racial stereotypes.
• Quote:

  "...a kind of undercurrent...of early modern English culture was impressions or recognitions of the beauty of certain African peoples..." — Professor Harpham ([79:27])

Debates on Christianity, Freedom, and New Racial Orders

• In the late 17th century, the question of whether Christian baptism should bring emancipation for slaves became crucial. Planters in the colonies asserted that even Christian Africans could justly remain slaves, marking a pivotal move toward explicitly racial justifications ([81:09]).
• Harpham argues that, by the close of his study’s period (1700), color had become a more prominent marker of difference and rationalization for enslavement, setting the stage for later developments in the 18th and 19th centuries.

Notable Quotes and Memorable Moments

• On the central question:

  "How did what we now understand to be the most terrible wrong in the history of this nation first come to be seen not only as necessary or profitable, but as legitimate from a moral point of view?" — Professor Harpham ([05:33])

• On shifting the frame:

  "...the central site of ideas...was not so much attempts to justify or explain slave institutions as they were developing very rapidly in...the English, you know, American colonies, but it was rather the attempt to justify the sources of African slavery..." — Professor Harpham ([35:56])

• On Barbados and new forms of cruelty:

  "...conditions in Barbados for people who were enslaved were so horrific...this form of slavery is a fate worse than death." — Professor Harpham ([58:55])

• On the interlocking of racial and legal discourses:

  "I want to see the process by which the two strands...really did come together and not assume from the start two discourses are not just related, but the same." — Professor Harpham ([81:06])

Timestamps for Key Segments

• Origin of the Project and Intellectual Framing: [02:43]–[07:50]
• Classical Roots: Aristotelian and Roman Law, and the Torrid Zone: [08:08]–[13:11]
• Grotius, Hobbes, Pufendorf, and Early Modern Rights Theory: [13:33]–[20:33]
• Bodin, Locke, and English Debates on Slavery: [20:53]–[27:20]
• Colonial Violence, Native Resistance, and Slavery Justification: [27:35]–[34:25]
• Africa in English Thought, Hakluyt, and Prester John: [34:42]–[45:47]
• Cartography and Challenges to Classical Accounts: [46:23]–[50:52]
• Slavery as "Saved from Death" in Roman and African Practice: [51:29]–[57:17]
• Early Abolitionist Critique in the Caribbean: [57:36]–[63:59]
• The Curse of Ham and Theories of Blackness: [63:59]–[76:12]
• Scientific Inquiry, Seminal Impression, and Black Beauty: [76:33]–[80:41]
• Christian Conversion and the Racialization of Slavery: [81:09]–[90:24]
• Future Work and Concluding Thoughts: [90:35]–[92:33]

Book’s Future and Series

• Harpham reveals this is the first of a planned three-volume series on the intellectual history of slavery in the Anglo-American world, designed to parallel and extend the work of David Brion Davis ([90:35]).

This episode provides a rich, careful exploration of how English ideas about law, nature, difference, and commerce shaped the Atlantic world’s most enduring and destructive institution. Drawing on obscure and canonical sources alike, Harpham asks us to reconsider the roots of slavery not as inevitable outcomes of economic forces but as the products of evolving, often contested, intellectual traditions.