The Joint Comprehensive Plan of Action was the product of more than a decade of negotiations initiated by three European countries in the absence of US-Iran dialogue. The talks succeeded only after the United States took a leading role and the stars aligned in Tehran and Washington with two governments determined to reach a deal. In his third book on US-Iran diplomacy, Trita Parsi details the history of those talks and the reasons for their success, as well as the challenges the agreement now faces. 

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Atlantic Council
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