War, Coalitions, and the HUnlan Condition War is older than the human species. It is found in every region of the world, among all the branches of humankind. It is found throughout human history, deeply and densely woven into its causal tapestry. It is found in all eras, and in earlier periods no less than later. There is no evidence of it having originated in one place, and spread by contact to others. War is reflected in the most fun-damental features of human social life. When indigenous histories are composed, their authors invariably view wars -unlike almost all other kinds of events -as preeminently worth recording. The foundational works of human literature -the Iliad, the Bhagavad-Gita, the Tanakh, the Quran, the Tale of the Heike -whether oral or written, sacred or secular -reflect societies in which war was a pervasive feature. War is found throughout prehistory (LeBlanc and Register 2003; LeBlanc 1999; Keeley 1996). Wherever in the archaeological record there is sufficient evidence to make a judgment, the traces of war are to be found. It is found across all forms of social organization -in bands, chiefdoms, and states. It was a regular part of hunter-gatherer life wherever population densities were not vanishingly low, and often even in harsh and marginal habitats. The existence of intergroup 191 conflict in chiIIlpanzees suggests that our ancestors have been prac-ticing war for at least 6 n1illion years, and that it was a selective pres-ence acting on the chimpanzee-horninid COn1ITlOn ancestors and their descendants (Manson and Wranghan1 1991; Wilson and Wranghanl 2003; BoehIIl 1992). The evidence indicates that aggressive conflict ainong our foraging ancestors was substantial enough to have con-stituted a nlajor selection pressure, especially on nules (Keeley 1996; Manson and Wranghain 1991). Careful ethnographic studies of liv-ing peoples support this view (Chagnon 1983; Heider 1970). Indeed, in some ethnographically investigated snull-scale societies where actual rates can be Ineasured, a third of the adult rIlales are reported to die violently (Keeley 1996), with rates going as high as 59 percent, reported for the Achuar (Bennett Ross 1984). Coalitions especially male coalitions -and intergroup rivalries are a cross-culturally univer-sal feature of hUlnan societies ranging iI-OlIl hunter-gatherer societies to complex, post-industrial societies. Expressions of coaiitionalisni include states, politics, war, racisnl, ethnic and religious conflict, civil war, castes, gang rivalries, rnale social clubs, con1petitive tealn sports, video gaInes, and war re-enactIIlent (Alexander 1987; Keegan 1994; Sidanius and Pratto 2001; Tiger 1969; Tooby and Cosnlides 1988; Tooby, CosIIlides, and Price 2006).