Deciding to Keep Peace: An Analysis of International Influences on the Establishment of Third-Party Peacekeeping Missions

Abstract

Since the end of World War II, and particularly since the end of the Cold War, there has been an expansion in the number of third-party peacekeeping missions established throughout the world. Most of the expansion in peacekeeping missions in the past decade or so has occurred in states experiencing intrastate or civil conflicts. The questions addressed in this study are under what conditions do third-party actors either decide to establish or decide not to establish peacekeeping missions in intrastate disputes, and specifically, what effect do international-level factors have on the likelihood that third-party peacekeeping personnel will be deployed in an intrastate dispute? The previous literature on third-party peacekeeping and interventions is used to derive a set of theoretical arguments and hypotheses regarding the establishment of peacekeeping missions by third-party actors (the United Nations, regional organizations, and ad hoc groups of states) during the post-World War II period. Specifically, I argue that several factors originating at the level of the international system influence the occurrence of third-party peacekeeping missions. The results of statistical analyses of the hypotheses largely support the notion that a set of international-level factors significantly influences the decisions of third-party actors to establish or not establish third-party peacekeeping missions, that international-level factors are more important than state-level factors, that these factors often have different effects on the likelihood of different types of third-party peacekeeping.

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