An arc of instability stretching across Africa's Sahel region, an area of strategic interest for the United States and its allies, is plagued by violent extremist organizations (VEOs). These organizations, including Boko Haram, al Qaeda, and other terror groups, have metastasized and present a serious threat to regional stability. Now these VEOs are transitioning. Under sustained pressure from French and regional security forces, and reeling from the loss of senior leaders, many of these groups feel backed into a corner. Despite setbacks, these groups continue to plague the region. To enhance...