This dissertation focuses on post-conflict Bosnia, one of Europe's most divided post-conflict societies, and where the external leadership of the state building process has been pronounced. The specific goal is to delineate a framework of analysis that accounts for the elite dynamics involved in the state building process in Bosnia in the context of the EU accession process. The main research question is: how and under what circumstances can external actors shape domestic change in deeply divided societies. How may external actors affect the interests, goals, and strategies of domestic actors in post-conflict, divided societies. Can local actors resist external pressure. In order to explore these issues empirically, this dissertation examines the process of constitutional reform in Bosnia in 2005-2006, and draws from 80 personal interviews with the key players and other actors involved. The thesis brings a large body of evidence into a process that was, heretofore, largely unknown and shrouded in secrecy. The dissertation is framed within the paradigms of state building and international conditionality; which I argue do not adequately capture the nuances and complexities of post-conflict Bosnia. Drawing from the literature on conflict regulation and other plural society theories, I propose a unique three-tiered framework, and argue that this approach represents a more comprehensive construct for analyzing post-conflict Bosnia. More specifically, this approach dissects the process of constitutional reform from an inter-ethnic, intra-ethnic, and what I term 'supra-national' level (the latter referring to the interactions between domestic and external actors). The study of these interactions is likely to help us define better policies in post-conflict state building processes. I conclude that the international push in Bosnia, and the transformative power of the EU were blunted by an ethnic power game. While external actors did play a substantive role, the neglect of intra-ethnic dynamics rendered external actors' efforts at shaping the process of constitutional reform in Bosnia ineffective.