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Comprehensive peace agreements (CPAs) are the most impactful negotiated settlements ending civil wars, but their implementation varies across post-conflict countries and over time. To explain varying implementation, this study identifies central challenges in CPA implementation and suggests that international third parties are uniquely positioned to overcome them. (1) IGOs with high economic leverage, and (2) prior foreign aid both set incentives that reduce domestic barriers to implementation. Quantitative evidence on the implementation of CPAs from 1989-2015 supports this argument. Both post-conflict countries' participation in IGOs with high economic leverage and higher volumes of prior foreign aid are associated with higher rates of CPA implementation. Multiple estimation approaches, including instrumental variables, support this finding. Case evidence from the 2007 CPA in Ivory Coast tracks the processes by which IGOs and donors help overcome stakeholder resistance and facilitate implementation. This finding encourages more concerted efforts by policymakers to advance CPA implementation. [ABSTRACT FROM AUTHOR]