Battle Cry of Freedom: The Civil War Era (1988) by James M. McPherson is a Pulitzer Prize–winning volume in the Oxford History of the United States series. Widely regarded as a definitive account of the American Civil War, the book explores the political, social, economic, and military forces that shaped the conflict. McPherson traces the roots of the war from the Mexican-American War through the Confederate surrender, arguing that the Civil War was the culmination of decades of growing ideological division. He highlights how both the North and South believed they were defending the core American ideals of liberty and democracy—though their interpretations sharply diverged. Blending deep historical analysis with compelling narrative, Battle Cry of Freedom offers a comprehensive and balanced portrait of a nation torn apart yet united by its foundational principles.