Originally published in 1990, this distinguished history has been revised and updated, especially to take into account the new Islamic republics of the former Soviet Union. Pan-Islam, of course, has failed to integrate the many diverse Muslim states, and Landau foresees nothing to change this prospect. He offers the thought, however, that Islam might yet provide some loose confederacy of Islamic states. But proponents of the clash of civilizations will find little grist for their mill in this careful historical overview.