But by some of the most important metrics used to gauge the strength of a terrorist threat, the death of al-Baghdadi will not have a momentous effect on the security of the American homeland. After all, no overseas jihadist terrorist organization has carried out a deadly attack inside the United States since 9/11, and none of the few deadly “ISIS-inspired” homegrown terrorists in recent years received training or support from ISIS overseas. America since 9/11 is a hard target for foreign terrorist groups.