The beginning of the historical trajectory is marked by a phenomenon of tremendous relevance, currently assumed to mark the shift from prehistory to history in the proper sense. The phenomenon can be labeled in various ways. We can use the label ‘‘urban revolution,’’ if we want to underscore demography and settlement forms, or the ‘‘First Urbanization’’ if we take into account the subsequent cycles of urbanization. We can speak of the origin of the state or the early state, if we prefer to underscore the political aspects. We can also emphasize the beginning of a marked socio-economic stratification, and of specialized crafts, if we want to underscore the mode of production. We can also use the term ‘‘origin of complexity,’’ if we try to subsume all the various aspects under a unifying concept. The origin of writing has also been considered to mark the beginning of true and proper history, because of the old-fashioned idea that there is no history before the availability of written sources. But now that such an idea is considered simplistic or wrong, we still can consider writing the most evident and symbolic culmination of the entire process.
The ‘‘revolution’’ took place in Lower Mesopotamia, now southern Iraq, and was the result of particular technological improvements and socio-political strategies. The agricultural production of barley underwent a notable, possibly tenfold, increase thanks to the construction of water reservoirs and irrigation canals, of long fields adjacent to the canals watered by them, and thanks to the use of the plow, of animal power, of carts, of threshing sledges, of clay sickles, and of improved storage facilities. The agricultural revolution could not have taken place without the managerial activity of central agencies, the temples, which were able to overcome the purely local strategy of survival carried on by the rural villages.
The technological improvements alone, however, could generate no ‘‘revolution’’ at all if the food-producers had devoted the entire surplus to their own consumption. The role of the central agency was decisive in diverting most of the surplus to social use: both for financing the common structures (irrigation networks, temple building, defensive walls), and for the maintenance of the specialized craftsmen and the sociopolitical elite. The ‘‘redistributive’’ economy of the early state, centered on the temples, was not based on the procedure of taxation, that is, the extraction of a part of the product from the producers’ families or local communities, but basically on the procedure of forced labor or corvee work imposed on local communities to work the temple lands. In this way the central agency, the owner of the best irrigated lands, could transfer to the local communities most of the social costs, paying just the rations for the workmen but not their families in limited periods of harvest and other seasonally concentrated operations.
The result of the technological improvements was a rate of seed to crop around 1:25 in comparison to 1:5 outside the river valleys. The result of the central management was that only 1/3 of the crop covered the expenditures of seed for the next year, rations for workmen and animals, and 2/3 went to the central agency for the social uses described above. Also the breeding of sheep and goats for the production of wool underwent a tremendous increase under temple management, again thanks to technology (the weaving loom) and social exploitation (slave women and children concentrated in temple factories). The administration of an economy based on unequal transfers of product, rations, and services generated writing. Already available tools (tokens, seals, clay sealings) were coordinated to produce round clay seals we call bullae, then ‘‘numerical’’ tablets, and finally proper clay tablets with numbers and logographic icons for the various items to be recorded. The ‘‘archaic texts’’ from the city of Uruk levels IV-III attest the organization of scribes, schools, and archives.
The transition from the Late Chalcolithic (the Ubaid culture in Mesopotamia) to the early urban economy around 4000 bce went hand in hand with the sudden increase in the size and structure of the city and of the temples. As for the cities, the transition from the small villages and hamlets of the Ubaid period (under one hectare or 2.47 acres in size) to the walled cities like Uruk (70 hectares or 172.9 acres) is quite impressive. Inside the cities, the small shrines of the Ubaid period, which were devoted to cultic use only, became large buildings including shops and stores besides the sanctuary of the god, along with the apartments of the clergy and the administrative personnel. The social changes were as important: beside the rural communities, based on family structures and communal self-government, a ruling class emerged as the necessary premise, but also the result, of the centralized administration of the economy.
The Uruk culture is so called because of the archaeological discoveries at that site. In Uruk the entire complex of Eanna (with the adjacent Anu temple) has been excavated, while the contemporary levels in other Lower Mesopotamian sites remain hardly touched by digging. The only other important center of the same period in the lowlands is Susa in Iranian Khuzistan. The impression that Uruk could have been the most important center in the period is probably correct, since it is supported by memories preserved in the later mythological and epic literature of Sumer.
The paramount role of the temple in the Uruk period was the obvious result of the strongly unequal relationships that the complex structure of the early state introduced into society. The elite could successfully exploit the rural population only by convincing them that their work was intended to support the god, his house, and his properties. A religious mobilization was necessary in order to keep the unequal relationships effective and enduring. No purely physical constraint could have been effective, but the ideological constraint made the exploitation tolerable. The priestly leadership also had the effect of depriving the kinship groups of their role and thwarted their ambitions for prestige; the priests moved the whole community toward an impersonal management.
Outside the core area, Uruk culture spread in a wide periphery, by means of various types of colonies and outposts. Upper Mesopotamia was colonized both along the Euphrates (at Habuba Kabira and Jebel Aruda) and the Tigris (at Nineveh) and in the Syrian Jazira (at Hamukar and Tell Brak). The most remote colonies were located along access routes to the highlands of Anatolia (at Samsat and Hassek Hoyuk) and on the Iranian plateau (at Godin Tepe). Important local cities were also influenced by the Uruk culture in their autonomous development (Arslan Tepe is the best known site of this type). Trade and access to highland resources (copper and timber in Anatolia, tin and semi-precious stones in Iran) were most probably the main factors for the spread of the Uruk colonies, and the resultant ‘‘regional system’’ brought different ecosystems and cultural traditions into reciprocal relationships. During the same period, the Early Dynastic civilization of Egypt underwent a similar process of state formation and urbanization, but remained separate from Mesopotamian civilization, except for isolated contacts.
The collapse of the entire system came abruptly at the beginning of the third millennium. Most colonies were abandoned in Upper Mesopotamia and in the highlands. The destruction of the Uruk period complex at Arslan Tepe is really impressive, and the burial of a Trans-Caucasian chief on the top of the ruins may hint at the role of the pastoral mountaineers as responsible for the disaster. But the crisis is also visible in Lower Mesopotamia, with no northern intrusion, so that we can doubt whether the nomads were the primary factor in the collapse; they may just have profited from an internal structural crisis. In any case, the unitary horizon of the Uruk period was followed by the emergence of various local cultures: the Jemdet Nasr culture in Lower Mesopotamia, the Proto-Elamite in Susiana, the Ninevite V in Upper Mesopotamia, and others in Eastern Anatolia and in Iran. All of them are characterized by a decline of city life in the river valleys, or even by a total reversion to village life in the periphery. The ‘‘first cycle of urbanization’’ had come to its end.