The figure of 65 million World War II deaths includes all deaths and comes from White[1, 2]. The data sources for battle deaths (Correlates of War project, Gleditsch, PRIO and UCDP[1]) include reported deaths of civilians and soldiers during battle, but not indirect deaths like those from starvation. Estimates of fatalities in Syria are from UCDP[2]. We strongly recommend watching this interactive data-driven documentary, which puts all known wars in perspective: www.fallen.io. To interactively compare fatalities in wars since 1990, go to http://ucdp .uu.se.
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