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Why do states still need diplomats? Despite instantaneous electronic communication and rapid global travel, the importance of ambassadors and embassies has in many ways grown since the middle of the nineteenth century. However, in theories of international relations, diplomats are often neglected in favor of states or leaders, or they are dismissed as old-fashioned. David Lindsey develops a new theory of diplomacy that illuminates why states find ambassadors indispensable to effective intergovernmental interaction. He argues that the primary diplomatic challenge countries face is not simply communication - it is credibility. Diplomats can often communicate credibly with their host countries even when their superiors cannot because diplomats spend time building the trust that is vital to cooperation. Using a combination of history, game theory, and statistical analysis, Lindsey explores the logic of delegating authority to diplomats. He argues that countries tend to appoint diplomats who are sympathetic to their host countries and share common interests with them. Ideal diplomats hold political preferences that fall in between those of their home country and their host country, and they are capable of balancing both sets of interests without embracing either point of view fully. Delegated Diplomacy is based on a comprehensive dataset of more than 1,300 diplomatic biographies drawn from declassified intelligence records, as well as detailed case studies of the U.S. ambassadors to the United Kingdom and Germany before and during World War I. It provides a rich and insightful account of the theory and practice of diplomacy in international relations.

Abstract
Does resident diplomacy influence international outcomes? Theoretically, I argue that resident diplomats tend to adopt uniquely cooperative stances toward their hosts. I test this expectation using a natural experiment involving British visa issuance. Starting in 2007, the UK transferred visa decision making from local diplomatic posts to centralized hubs, located either at third country diplomatic posts or domestically. I study this rollout to credibly estimate the causal effects of visa adjudication by local posts. I find that resident diplomats implement a much more lenient visa policy—transferring adjudication to an outside hub reduces issuance by about fifteen percent. There is a robust difference between the behavior of local and third-country posts, showing that this cooperative effect of diplomacy is relationship-specific.

This dissertation explores the relationship between informational asymmetries and costly conflict in the international system. While it is well-known that information asymmetries may cause conflict, little research explores the origins of such asymmetries. This dissertation explores the role of intelligence, diplomacy, and military strategy in revealing information. I show that, under broad conditions, states will often fail to disclose information about themselves and fail to gather information about their opponents. In consequence, the ability to gather information does not undermine the link between uncertainty and war.