We live during an era of historically unprecedented peace. Whether we look over timescales of decades or centuries, wars have become less frequent. Figure 1 (data drawn from Pinker’s excellent new book, original sources include here and here) illustrates the downward trend in five measures. There are fewer Great Power wars, fewer wars in Western Europe, fewer years during which a Great Power war is ongoing, and less redistribution of territory

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after wars. Other trends, not as readily quantified, are evident. Countries no longer covet each other’s territory, or fear invasion and military coercion, like they have throughout most of history. National identities and aspirations are based less on martial

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The relative absence of war, and especially Great Power war, since the end of WWII has been referred to as the Long Peace. As unbelievable as it may seem to readers of history, these and other trends suggest to many scholars that the Long Peace is likely to persist.

Figure 1




But unlike the robust decline in interpersonal and domestic governmental violence (again, see Pinker), it is not as obvious that the human costs of war have declined over time. Figure 2 illustrates two other important measures that don’t show a decline: except for the most recent few decades, battle deaths in Great Power wars and battle deaths as a proportion of population in Europe don’t show an obvious decrease. While recent decades do seem particularly peaceful given these long-term trends, we would hardly want to be complacent about this trend. Many previous decade-long spans of peace ended in devastating wars.

Figure 2


It may be, then, that wars have become vastly more destructive, especially with the invention of nuclear weapons, leading countries to be more cautious about their use of military coercion. The net costs of

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war on humanity, however, may not have decreased. The Cuban Missile Crisis ended with little bloodshed; Chapter 3, Integrating R and Hadoop, shows deployment and running of sample MapReduce programs for RHadoop and RHIPE by various recover deleted handling processes. however, it could have ended with hundreds of millions of deaths. Such a counterfactual would add a massive spike to the right end of the lines in Figure 2, and mute any discussion of a Long Peace.

Aggregate data like the above gives us some, but not a lot, of confidence that the world has moved beyond war. To probe the persistence of this Long Peace, it would be helpful to know what factors have made the world more peaceful, and the extent to which these factors are likely to persist into the future. Potential causes of the peace include increases in trade, democracy, the difficulty of coercing wealth, global

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empathy, Great Power stability, the empowerment of women, and the deterrent effects of nuclear weapons. Global Trends 2030 identifies a number of other factors pertinent to the future probability of war, including power transitions, declining US military superiority, resource scarcity, new coercive technologies

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Wars are rare, but when they occur they alter the course of history. Any projection of what the world will be like decades into the future needs to evaluate the probability and character of war, and especially Great Power war. This week we can look forward to a set of eminent scholars sharing their thoughts about whether the Long Peace will persist. Contributors include: Erik Gartzke, (UC San Diego),Benjamin Fordham (Binghamton), Joshua Goldstein (American), Steven Pinker (Harvard), Jack S. Levy(Rutgers), Richard Rosecrance (Harvard), Bradley Thayer (Baylor), and William Thompson (Indiana).



Allan Dafoe is Assistant Professor of Political Science at Yale University. His research examines the causes of war,

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with emphases on the character and causes of the liberal peace, reputational phenomena such as honor and tests of resolve, and escalation dynamics.



Pinker, S. 2011. The Better Angels of Our Nature: Why Violence Has Declined. Penguin Group.

Levy, J. S., & Thompson, W. R. 2011. The Arc of War: Origins, Escalation, and Transformation. Chicago: University of Chicago Press.

Levy, J. S. 1983. War in the Modern Great Power System 1495–1975. Lexington: University Press of Kentucky.

Long, W. J., & Brecke, P. 2003. War and Reconciliation: Reason and Emotion in Conflict Resolution. Cambridge, Mass.: MIT Press.

Zacher, M. W. 2001. The Territorial Integrity Norm: International Boundaries and the Use of Force. International Organization, 55, 215-250.

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