The industry that brought great wealth to European manufacturers and merchants, and bleak employment to hundreds of thousands of mill workers, had also catapulted the United States onto center stage of the world economy, building “the most successful agricultural industry in the States of America which has been ever contemplated or realized.” Cotton exports alone put the United States on the world economic map. On the eve of the Civil War, raw cotton constituted 61 percent of the value of all U.S. products shipped abroad. Before the beginnings of the cotton boom in the 1780s, North America had been a promising but marginal player in the global economy.

Now, in 1861, the flagship of global capitalism, Great Britain, found itself dangerously dependent on the white gold shipped out of New York, New Orleans, Charleston, and other American ports. By the late 1850s, cotton grown in the United States accounted for 77 percent of the 800 million pounds of cotton consumed in Britain. It also accounted for 90 percent of the 192 million pounds used in France, 60 percent of the 115 million pounds spun in the Zollverein, and 92 percent of the 102 million pounds manufactured in Russia.

The reason for America’s quick ascent to market dominance was simple. The United States more than any other country had elastic supplies of the three crucial ingredients that went into the production of raw cotton: labor, land, and credit. As The Economist put it in 1861, the United States had become so successful in the world’s cotton markets because the planter's “soil is marvelously fertile and costs him nothing; his labor has hitherto been abundant, unremitting and on the increase; the arrangements and mercantile organizations for cleaning and forwarding the cotton are all there." By midcentury, cotton had become central to the prosperity of the Atlantic world. Poet John Greenleaf Whittier called it the “Hashish of the West,” a drug that was creating powerful hallucinatory dreams of territorial expansion, of judges who decide that “right is wrong,” of heaven as “a snug plantation” with “angel negro overseers.”

Slavery stood at the center of the most dynamic and far-reaching production complex in human history. Too often, we prefer to erase the realities of slavery, expropriation, and colonialism from the history of capitalism, craving a nobler, cleaner capitalism. Nineteenth-century observers, in contrast, were cognizant of cotton's role in reshaping the world. Herman Merivale, British colonial bureaucrat, noted that Manchester’s and Liverpool’s “opulence is as really owing to the toil and suffering of the negro, as if his hands had excavated their docks and fabricated their steam-engines.” Capital accumulation in peripheral commodity production, according to Merivale, was necessary for metropolitan economic expansion, and access to labor, if necessary by coercion, was a precondition for turning abundant lands into productive suppliers of raw materials.