In the wake of the September 11 attacks, President George W. Bush drew a line in the sand, saying, "Either you are with us or you are with the terrorists." Since 9/11, many counterterrorism partners have been both "with" and "against" the United States, helping it in some areas and hindering it in others. This has been especially true in the Middle East, Africa, and South Asia, where the terrorist groups that threaten America are most concentrated...