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Originally Posted by Pinker
At the century scale, it is hard to find quantitative studies of deaths in warfare spanning medieval and modern times.
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Social histories of the West provide evidence of numerous barbaric practices that became obsolete in the last five centuries, such as slavery, amputation, blinding, branding, flaying, disembowelment, burning at the stake, breaking on the wheel, and so on. Meanwhile, for another kind of violence—homicide—the data are abundant and striking. The criminologist Manuel Eisner has assembled hundreds of homicide estimates from Western European localities that kept records at some point between 1200 and the mid-1990s. In every country he analyzed, murder rates declined steeply—for example, from 24 homicides per 100,000 Englishmen in the fourteenth century to 0.6 per 100,000 by the early 1960s.
On the scale of decades, comprehensive data again paint a shockingly happy picture: Global violence has fallen steadily since the middle of the twentieth century. According to the Human Security Brief 2006, the number of battle deaths in interstate wars has declined from more than 65,000 per year in the 1950s to less than 2,000 per year in this decade. In Western Europe and the Americas, the second half of the century saw a steep decline in the number of wars, military coups, and deadly ethnic riots.
Zooming in by a further power of ten exposes yet another reduction. After the cold war, every part of the world saw a steep drop-off in state-based conflicts, and those that do occur are more likely to end in negotiated settlements rather than being fought to the bitter end. Meanwhile, according to political scientist Barbara Harff, between 1989 and 2005 the number of campaigns of mass killing of civilians decreased by 90 percent.
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