This article summarizes the Correlates of War Intergovernmental Organizations (IGO) Version 3.0 datasets. The new datasets include information about the population of IGOs in the international system and state participation in those formal international institutions from 1816 to 2014. Consistent with Versions 2.0 and 2.3, Version 3.0 of the IGO data comes in three forms: country-year, IGO-year, and joint dyadic membership. This article briefly describes the data collection process and identifies important changes to the dataset before moving to analyze fundamental patterns in the data. Most notable among the changes from earlier versions of the data is the inclusion of annual membership data for the 1815–1964 time period. In addition, we present information about the overall trends in the institutionalization of cooperation at both the global and regional levels, with the latter focusing on the interesting membership dynamics in Asia and Africa. We then track and discuss patterns in state memberships and examine how these changes manifest in the dyadic data. The article concludes with a discussion of how the COW IGO 3.0 data compare to other prominent datasets on state participation in international institutions and highlights some new areas of research that will benefit from the release of the updated IGO membership dataset.

While peacekeeping’s effects on receiving states have been studied at length, its effects on sending states have only begun to be explored. This article examines the effects of contributing peacekeepers abroad on democracy at home. Recent qualitative research has divergent findings: some find peacekeeping contributes to democratization among sending states, while others find peacekeeping entrenches illiberal or autocratic rule. To adjudicate, we build on recent quantitative work focused specifically on the incidence of coups. We ask whether sending peacekeepers abroad increases the risk of military intervention in politics at home. Drawing on selectorate theory, we expect the effect of peacekeeping on coup risk to vary by regime type. Peacekeeping brings with it new resources which can be distributed as private goods. In autocracies, often developing states where UN peacekeeping remuneration exceeds per-soldier costs, deployment produces a windfall for militaries. Emboldened by new resources, which can be distributed as private goods among the selectorate, and fearing the loss of them in the future, they may act to depose the incumbent regime. In contrast, peacekeeping will have little effect in developed democracies, which have high per-troop costs, comparatively large selectorates, and low ex-ante coup risk. Anocracies, which typically have growing selectorates, and may face distinctive international pressures to democratize, will likely experience reduced coup risk. We test these claims with data covering peacekeeping deployments, regime type, and coup risk since the end of the Cold War. Our findings confirm our theoretical expectations. These findings have implications both for how we understand the impact of participation in peacekeeping – particularly among those countries that contribute troops disproportionately in the post-Cold War era – and for the potential international determinants of domestic autocracy.

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