The Iran nuclear deal has the potential to stabilize the Middle East by neutralizing a major threat to regional and international security. But at a time of growing uncertainty and conflict in the region, will a nuclear deal compel Iran to play nice with its neighbors, or will it allow the Iranian regime to devote more resources to its militant regional proxies, further enflaming conflicts in Syria, Iraq, Yemen, and beyond? What is at stake the day after the deal is done for key American allies in the region, including Israel? What are the near and long-term implications of a deal, and how will it likely be judged by history?