Arguably, no event since the American Revolution has had a greater impact on US history than the Civil War. This devastating and formative conflict occupies a permanent place in the nation's psyche and continues to shape race relations, economic development, and regional politics. Naturally, an event of such significance has attracted much attention from historians, and tens of thousands of books have been published on the subject. Despite this breadth of study, new perspectives and tools are opening up fresh avenues of inquiry into this seminal era.

In this timely and thoughtful...