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One likely effect of the COVID-19 pandemic will be an increased focus on health diplomacy, a topic that has rarely been taken up by international relations scholars. After reviewing existing literature on health diplomacy, I argue for the utility of distinguishing states’ aims from their practices of health diplomacy in advancing our understanding of when states engage in health diplomacy with a bilateral, regional, or global scope. The recent history of twenty-first century infectious disease outbreaks suggests a possible move away from health diplomacy with global participation. COVID-19 provides numerous examples, from widespread criticism of the World Health Organization to increased bilateral health aid and the creation of a regional vaccine initiative. As pandemics become more frequent, however, more localized health diplomacy is likely to be less effective, given the necessity of global mitigation and containment.

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We argue that system-level international changes have made secessionism more attractive since 1945, and that this is one of the reasons for the recent proliferation of aspiring states. Using original data on secessionist movements between 1816 and 2011, we document that secessionism became significantly more common after 1945. Whereas much of the existing literature explains secessionism by pointing to local or unitlevel factors, we contend that security, economic, and normative changes at the international level have effectively increased the benefits of independence, without a commensurate increase in the costs. We use interviews with representatives of new states, secessionist groups, and international organizations to provide empirical support for these claims. We conclude by considering three extensions of our argument: (i) Does the nature of the changing international environment affect the way in which secessionists attempt to achieve their goals? (ii) What future changes might amplify or depress this trend? (iii) Who are the specific people benefiting from statehood, and can their position within a would-be state help us understand the nature of secessionism today? 1 Authors' notes: For valuable comments and suggestions, we thank

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