Almost forgotten in the haze of events that followed Nagasaki and Hiroshima, the summer of 1945 witnessed an intense public debate over how best to end the war against Japan. Weary of fighting, the American people were determined to defeat the imperial power that had so viciously attacked them in December 1941, but they were uncertain of the best means to accomplish this goal. Certain of victory -- the "inevitable triumph" promised by Franklin Roosevelt immediately after Pearl Harbor -- Americans became increasingly concerned about the human cost of defeating Japan.

Particularly...