This monograph examines the impact that the “Arab Spring” has had on how Arab states relate to each other post-regime change and post-Islamist electoral victory. It shows that the region is undergoing a profound change as some traditional regional policy actors are paralyzed by internal turmoil (such as Syria and Egypt), while others do not have a regional ambition (such as Algeria and Morocco). The region has therefore entered a Gulf moment where key decisions pertaining to the region’s future are now taken in Riyadh, Doha, and Abu Dhabi. From having once been mere bystanders of regional politics, the Gulf States have moved to become players with both the ambition and capability to shape regional dynamics. As the ripple effects of their 2014 rift show, these dynamics will have a wider Arab impact.