Lex Fridman interviews historian Gary Gallagher about the American Civil War, identifying slavery’s expansion as the primary cause while distinguishing it from soldiers' motivations to preserve the Union. Gallagher explains how the Confederacy functioned as a rival republic and how Lincoln’s Emancipation Proclamation served as a strategic military tool. The discussion also covers the war’s immense scale, the role of key figures like Lincoln and Lee, and the complex racial attitudes of the era.
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