In 1883, an Italian-crewed lugger moved slowly through the shallow, murky waters of the Louisiana bayou. At times the men aboard used poles, or grabbed onto muddy banks with their bare hands, to push the small ship through the swamp amid a cacophony of frogs and insects. A day’s journey east from New Orleans, Lafcadio Hearn, a correspondent for Harper’s Weekly, saw the first steep-roofed houses rising on stilts above the green waters of Lake Borgne. The lugger and its crew had arrived at a place few outsiders ever visited:…