was little doubt about what the results would be. “If he cannot make successful war upon the insurgents,” wrote The New York Times in 1896, “he can make war upon the unarmed population of Cuba.”

Civilians were forced, on penalty of death, to move into these encampments, and within a year the island held tens of thousands of dead or dying reconcentrados, who were lionized as martyrs in U.S. newspapers. No mass executions were necessary; horrific living conditions and lack of food eventually took the lives of some 150,000 people.

These camps did not rise out of nowhere. Forced labor had existed for centuries around the world, and the parallel institutions of Native American reservations and Spanish missions set the stage for relocating vulnerable residents away from their homes andforcing them to stay elsewhere. But it was not until the technology of barbed wire and automatic weapons that a small guard force could impose mass detention. With that shift, a new institution came into being, and the phrase “concentration camps” entered the world.

When U.S. newspapers reported on Spain’s brutality, Americans shipped millions of pounds of cornmeal, potatoes, peas, rice, beans, quinine, condensed milk, and other staples to the starving peasants, with railways offering to carry the goods to coastal ports free of charge. By the time the USS Maine sank in Havana harbor in February 1898, the United States was already primed to go to war. Making a call to arms before Congress, President William McKinley said of the policy of reconcentración: “It was not civilized warfare.