It remains contested whether peacekeeping works. The impact of peacekeepers' actions at the local (or subnational) level for overall mission success has lately received critical attention. Local peacekeeping is expected to matter because it re-assures local actors, deters resumption of armed hostilities, coerces parties to halt fighting, and makes commitment to agreements credible. Thus peacekeepers affect the relations between central and local elites and avoid the emergence of local power vacuums and areas of lawlessness. This study uses new subnational data on the deployment of United Nations peacekeepers. It uses matching and recursive bivariate probit models with exogenous variables for temporal and spatial variation to deal with possible non-random assignment of the treatment. It is demonstrated that conflict episodes last shorter when peacekeepers are deployed to conflict-prone locations inside a country, even with comparatively modest deployment. The effect of peacekeeping on the onset of local conflict is, however, less clear-cut.

Theories of mobilization suggest that groups are more likely to resort to violence in the presence of political opportunity structures that afford greater prospects for extracting concessions from the government or better opportunities to topple ruling governments. However, existing efforts to consider the possible influences of political opportunity structures on incentives for violence and civil war empirically have almost invariably relied upon measures of democracy to proxy for the hypothesized mechanisms, most notably the argument that the opposing effects of political accommodation and repression will give rise to an inverted U-shaped relationship between democracy and the risk of civil war. The authors detail a number of problems with measures of democracy as proxies for political opportunity structures and develop alternative measures based on the likely risks that political leaders will lose power in irregular challenges and their implications for the incentives for resort to violence. The authors evaluate empirically how the security with which leaders hold office influences the prospects of violent civil conflict. The findings indicate that recent irregular leader entry and transitions indeed increase the risk of conflict onset, while democratic institutions are found to decrease the risk of civil war, after controlling for the new measures of state weakness.

For a given number of troops in a peace operation, is it advisable to have soldiers from one country, or should the U.N. recruit peacekeepers from a variety of donors? Since 1990, the number of contributors to peace operations has grown threefold and most operations have carried the mandate to protect civilians. We explore the effect of diversity in the composition of a mission, measured by fractionalization and polarization indices, on its performance in protecting civilians in Africa in the period 1991-2008. We find that diversity decreases the level of violence against civilians, a result that holds when geographic and linguistic distances between countries are considered.

Research has shown that United

Ideas shape human behavior in many circumstances, including those involving political violence. Yet they have usually been underplayed in studies of the causes of armed mobilization. Likewise, emotions have been overlooked in most analyses of intrastate conflict. A mixed-methods analysis of Italian resistance during the Fascist regime and the Nazi occupation (1943–45) provides the opportunity to theorize and analyze empirical evidence on the role of indignation and radical ideologies in the process of armed mobilization. These nonmaterial factors play a crucial role in the chain that leads to armed collective action. Indignation is a push factor that moves individuals away from accepting the status quo. Radical ideologies act as pull factors that provide a new set of strategies against the incumbent. More specifically, detachment caused by an emotional event disconnects the individual from acceptance of the current state of social relations, and individuals move away from the status quo. Ideologies communicated by political entrepreneurs help to rationalize the emotional shift and elaborate alternative worldviews (disenchantment), as well as possibilities for action. Finally, a radical ideological framework emphasizes normative values and the conduct of action through the “anchoring” mechanism, which can be understood as a pull factor attracting individuals to a new status.

Peacekeeping has been one of the main conflict management tools used by the international community to restore or safeguard peace and security. Since 1948, the United Nations has established 70 peace operations and has substantially evolved, adopting approaches to peace that extend beyond purely military concerns. Indeed, the promises of peacekeeping as effective instrument of conflict reduction may, to some extent, explain the evolution toward multidimensional missions and the unprecedented number of peacekeepers deployed in the last decade. As consequence, the growing importance of peacekeeping effectiveness has sparked a new wave of research that empirically investigates whether and under which conditions UN peacekeeping works. Peacekeepers are mostly deployed in conflict or postconflict environments where violence is either ongoing or lingering. Thus, violence remains a priority for peace missions. Consequently, peacekeeping is deemed successful or effective according to whether it curbs conflict in several dimensions. Effective missions are those responsible for decreasing the intensity of battle violence, protecting civilians, and containing conflict diffusion and recurrence in the postwar phase. Each mission, however, is deployed in different contexts and operates under variable conditions that affect the operation’s capacity to influence conflict. Concerning mission features, peacekeeping success is more likely when large contingents are deployed under robust mandates. Mission type, size, and composition signal credible commitment from the international community and empower peacekeepers to halt violence while guaranteeing the implementation of peace agreements. These nuanced understandings of peacekeeping stem from the availability of new data on both conflict and peace operations at the national and subnational levels of analysis. Moreover, the empirical study of the effectiveness of peace operations has recently been flanked by simulation-based forecasting, field experiments, and surveys investigating local-level outcomes of peace missions. Unsurprisingly, the focus on violence and conflict outcomes as indicators of success is debatable. First, in dealing with violence, peacekeeping operations produce spillover effects that are largely neglected, such as refugee flows and terrorist violence. Second, given the wide range of functions performed by UN peacekeepers, including electoral assistance, economic reconstruction, and state building, it is reasonable to include these aspects when defining effectiveness. Third, and relatedly, no assessment of short- versus long-term implications of peacekeeping for political, social, and economic development in the host country has been forthcoming. While reducing infant mortality, inequality, and crime are not necessarily tasks for peacekeepers, it is vital to study whether and how UN missions may have shaped the quality of peace in host countries.

We highlight how efforts to collect systematic data on conflict have helped foster progress in peace and conflict research. The Journal of Peace Research has played a key role in these developments, and has become a leading outlet for the new wave of disaggregated conflict data.We survey progress in the development of conflict data and how this interacts with theory development and progress in research, drawing specifically on examples from the move towards a greater focus on disaggregation and agency in conflict research. We focus on disaggregation in three specific dimensions, namely the resolution of conflict data, agency in conflict data, as well as the specific strategies used in conflict, and we also discuss new efforts to study conflict processes beyond the use of violence. We look ahead to new challenges in conflict research and how data developments and the emergence of 'big data' push us to think harder about types of conflict, agency, as well as the 'right' level of aggregation for querying data and evaluating specific theories.3

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