The rise of the Islamic State of Iraq and the Levant (ISIL), and its capture of vast territories in the Fertile Crescent, has confounded the political calculations of a number of all major political players invested in the Arab region, including regional and global powers. With the failure of regional actors to contain the group, the United States was forced to backtrack on its military withdrawal from the region—when it pulled its troops out of Iraq—and become involved, anew, in the Middle East.