The later warmaking, by contrast, is an arid and inherently more competitive environment born of the Abrahamic old-world; with water-resources and petty states established under centralized, kingly rule, periodically extracting the ultimate taxation from their subjects by warmaking. I am by no means a scholar of that region's history but I perceive this model as carrying on primarily between Central Asia and the north-west of the Indian subcontinent in the east, to the easternmost edge of the Mediterranean in the west.
Although I do tend to look on these civilisations as being run by the bully at school who was beaten up by his dad and had no real idea why he was angry so much. If he was big clever and angry he could take over a tribe pretty quick and self select.