Celebrated historian Gary W. Gallagher highlights the complexity and richness of the war, from its origins to its memory, as topics for study, contemplation, and dispute. He places contemporary understanding of the Civil War, both academic and general, in conversation with testimony from those in the Union and the Confederacy who experienced and described it, investigating how mid-nineteenth-century perceptions align with, or deviate from, current ideas regarding the origins, conduct, and aftermath of the war. The tension between history and memory forms a theme throughout the essays, underscoring how later perceptions about the war often took precedence over historical reality in the minds of many Americans.