We have seen this story of bloodthirsty extremist violence before. In Somalia, in Yemen, in Iraq, and now in Algeria. A militant group moves into an ungoverned space where government lacks will or capability, where the group purports to represent the will of the people by instituting some strict version of Islam and imposing this vision with abhorrent ruthlessness. More broadly, in more than a decade of this global counterterror campaign, we have seen this battlefield shift from Afghanistan to Pakistan, Indonesia, Saudi Arabia, Iraq, Europe, and now Africa’s Sahel.