Since 9/11, some 300 Americans–born and raised in Minnesota, Alabama, New Jersey, and elsewhere–have been indicted or convicted of terrorism charges. Some have taken the fight abroad: Americans were among those who planned the attacks in Mumbai, and more recently a dozen US citizens have sought to join ISIS. Others have acted entirely on American soil. What motivates them, how are they trained, and what do we sacrifice in our aggressive efforts to track them? Paced like a detective story, United States of Jihad tells the entwined stories of the key actors on the American front. Among the perpetrators are Anwar al-Awlaki, the New Mexico-born radical cleric who became the first American citizen killed by a CIA drone and who mentored the Charlie Hebdo shooters; Samir Khan, whose Inspire webzine has rallied terrorists around the world, including the Tsarnaev brothers; and Omar Hammami, an Alabama native and hip hop fan who became a fixture in al Shabaab’s propaganda videos until fatally displeasing his superiors. Drawing on his extensive network of intelligence contacts, from the National Counterterrorism Center and the FBI to the NYPD, journalist and security expert Peter Bergen also offers an inside look at the sometimes controversial tactics of the agencies tracking potential terrorists–from infiltrating mosques to massive surveillance; as well as at the bias experienced by innocent observant Muslims at the hands of law enforcement and at the critics and defenders of US policies on terrorism.