Whitney Invents Cotton Gin: Slavery and Industry Transformed

Eli Whitney patented the cotton gin on March 14, 1794, a simple device with wire hooks that separated cotton fibers from seeds at fifty times the speed of manual processing. The machine transformed the economics of cotton cultivation overnight. Before the gin, short-staple cotton was barely profitable because cleaning the seeds was so labor-intensive. Afterward, cotton became the South's dominant cash crop and America's most valuable export. Whitney expected to profit from licensing his patent, but the gin was so simple that any blacksmith could build a copy. Imitations spread across the South within months, and Whitney spent years in futile patent litigation. The devastating unintended consequence was the explosive growth of slavery: cotton cultivation required massive labor forces, and the number of enslaved people in the South grew from roughly 700,000 in 1790 to nearly four million by 1860. Whitney's labor-saving device paradoxically created the greatest expansion of forced labor in American history.