The late twentieth century has witnessed the emergence of an unexpected and extraordinary phenomenon: Islamist political movements. Beginning in the early 1970s, militants revolted against the regimes in power throughout the Muslim world and exacerbated political conflicts everywhere. Their jihad, or "Holy Struggle," aimed to establish a global Islamic state based solely on a strict interpretation of the Koran. Religious ideology proved a cohesive force, gathering followers ranging from students and the young urban poor to middle-class professionals. After an initial triumph with the Islamic...