Amid the fear following 9/11 and other recent terror attacks, it is easy to forget the most important fact about terrorist campaigns: they always come to an end--and often far more quickly than expected. Contrary to what many assume, when it comes to dealing with terrorism it may be more important to understand how it ends than how it begins. Only by understanding the common ways in which terrorist movements have died out or been eradicated in the past can we hope to figure out how to speed the decline of today's terrorist groups, while avoiding unnecessary fears and costly overreactions....