to adapt in a step-wise process, and each development in military technology either requires or leads to comparable developments in politics and society. Many of the underlying assumptions of Morris's thinking can be traced back in some form or another not only to Carneiro but also to Jared Diamond, and particularly his 1997 book Guns, Germs, and Steel. Diamond, who explicitly opposes racist evolutionary tales, argues that the ultimate explanation of why different human development on different continents is the presence or absence of domesticable plants and animals as well as the fact that the east-west orientation of Eurasia made migration within similar climates much easier than the south-north orientation of Africa and the Americas. Nevertheless, he also stresses the importance of conflict and warfare as a proximate explanation for how Europeans managed to conquer much of the world, given how societies who fail to innovate will “tend to be eliminated by competing societies”. Similarly, Charles Tilly argues that what drove the political, social, and technological change which, after centuries of great variation with regard to states, lead to the European states ultimately all converging on the national state was coercion and warfare: “War wove the European network of national states, and preparation for war created the internal structures of states within it.” He describes how war became more expensive and complex due to the introduction of gunpowder and large armies and thus required significantly large states in order to provide the capital and manpower to sustain these, which at the same time were forced to develop new means of extraction and administration. However, Norman Yoffee has criticised such theorists who, based on general evolutionary frameworks, came to formulate theories of the origins of states and their evolution. He claimed that in no small part due to the prominence of neoevolutionary explanations which group different societies into groups in order to compare them and their progress both to themselves and to modern ethnographic examples, while focusing mostly on political systems and a despotic élite who held together a territorial state by force, “much of what has been said of the earliest states, both in the professional literature as well as in popular writings, is not only factually wrong but also is implausible in the logic of social evolutionary theory”. See also Accelerating change Biocultural evolution Clash of Civilizations Critical juncture theory Cultural diversity Cultural evolution Cultural materialism Cultural neuroscience Cultural