Terrorism is one of the driving geopolitical trends of our era. Spectacular events are recognized by their dates--for example, the 9/11 attacks in New York and Washington and the 7/7 London bombings. It was a terrorist attack that drew the United States into a war in the greater Middle East that has lasted over fifteen years. Many other attacks, including those in non-Western countries, receive far less attention even though they may be more frequent...