From journalistic accounts like Fiasco and Imperial Life in the Emerald City to insider memoirs like Jawbreaker and Three Cups of Tea, the books about America's wars in Iraq and Afghanistan could fill a library. But each explores a narrow slice of a whole: two wars launched by a single president as part of a single foreign policy. Now noted historian Terry Anderson examines them together, in a single comprehensive overview.

Shortly after the terrorist attacks of September 11, 2001, President George W. Bush told advisor Karl Rove, "I am here for a...