Very good. It's exhaustively researched and engagingly written, and does a decent job of discussing both the origins and impact of the war. It's a military history, so there's a lot of focus on the movements of armies and their ordnance and materiel, which can get a little dry (order of battle has never been my strong suit), but I learned a lot, especially when it came to US involvement. (We had troops in central Asia, helping Czech prisoners who took over the Trans-Siberian railway and shafted the Bolsheviks. I had NO clue.) Anyone who likes a history with a strong focus on military strategy and tactics will enjoy this.