This sweeping narrative presents an original and compelling explanation for the triumph of the antislavery movement in the United States prior to the Civil War. Abraham Lincoln's election as the first antislavery president was hardly preordained. From the country's inception, Americans had struggled to define slavery's relationship to freedom. Most Northerners supported abolition in the North but condoned slavery in the South, while most Southerners denounced abolition and asserted slavery's compatibility with whites' freedom. On this massive political fault line hinged the fate of the...