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The pillage that fueled America's tech booms

August 27, 2026

AI Summary

5 min read

In 2018, researcher Sidharth Kara traveled to the Democratic Republic of Congo to investigate the source of a metal essential to modern technology. He had spent two decades documenting modern slavery and child labor, but what he found left him "shell shocked." At a single mining site, he watched nearly 15,000 people—many of them teenage boys—crammed into a cavernous chasm, hacking at solid cobalt stone with mallets and rebar. No safety equipment. Toxic dust filling their lungs. Workers earning a few dollars a day to extract a mineral that would flow into the lithium-ion batteries powering smartphones, laptops, and electric vehicles worldwide. "How can their earth count less than ours?" Kara asks. "How can their children count less than ours?"

This is not a new story. The same pattern of extraction and exploitation has defined Congo's relationship with the global economy for more than a century—from King Leopold II's rubber terror in the 1890s to the Cold War assassination of Patrice Lumumba to the present-day cobalt rush. Each technological revolution has demanded resources that Congo possesses in abundance, and each time, the people living atop those resources have paid the price.

The rubber terror and the first human rights movement

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What you'll learn

  • 1 (01:10) **The Cobalt Contradiction** - Sidharth Kara introduces the central problem: the cobalt in our smartphones is extracted by desperate, impoverished workers in the Democratic Republic of Congo.
  • 2 (08:09) **The Moral Clock of Progress** - The episode frames the cobalt crisis as a modern echo of a 100-year-old pattern of exploitation in the Congo.
  • 3 (10:55) **The Whistleblower on the Dock** - The story of E.D. Morel, a shipping clerk in Antwerp in the 1890s who uncovered the brutal reality of King Leopold's Congo.
  • 4 (14:44) **The Scramble and the Rubber Goldmine** - The historical context of King Leopold II's personal colony and the sudden global demand for rubber that drove its exploitation.
  • 5 (18:45) **The Missionary with a Camera** - William Henry Shepherd, a Black American missionary, arrives in the Congo and begins documenting the beauty of its people and the horror of Leopold's regime.
  • 6 (26:48) **The Heart of Darkness** - Shepherd's eyewitness account of Leopold's terror campaign, including the use of a mercenary army to enforce rubber quotas through hostage-taking and mutilation.
  • 7 (31:20) **The First Human Rights Campaign** - Morel and Shepherd team up to form the Congo Reform Association, launching the first major international human rights scandal of the 20th century.

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Show Notes

Cobalt mining is one of the world's most dangerous jobs. And it's also one of the most essential: cobalt is what powers the batteries in your smartphone, your laptop, the electric car you felt good about buying. More than three-quarters of the world's cobalt supply lies in the Democratic Republic of Congo, whose abundant resources have drawn greed and grifters for centuries. This week on our series Hidden Histories, we reveal the fight for control of those resources, and for the dignity of the people who produce them. (This episode originally aired in 2023)

Guests: 

Siddharth Kara, author of Cobalt Red: How the Blood of the Congo Powers Our Lives

Adam Hochschild, author of King Leopold’s Ghost

Ramona Austin, art historian and former curator at the Art Institute of Chicago and the Dallas Museum of Art

Georges Nzongola-Ntalaja, African and global studies Professor Emeritus at the University of North Carolina and former UN ambassador for the Democratic Republic of Congo

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