Mesopotamia is a region in present-day Iraq. The word Mesopotamia is Greek, meaning “between the rivers,” and it refers to the area between the Tigris and Euphrates, two of the most important waterways in the ancient world. It is no coincidence that it was here that civilization was born: like nearby Egypt and the Nile river, early agriculture relied on a regular supply of water in a highly fertile region. The ancient Mesopotamians had everything they needed for agriculture, they just had to figure out how to cultivate cereals and grains (natural varieties of which naturally occurred in the area, as noted in the last chapter) and how to manage the sudden floods of both rivers.
Mesopotamia’s climate was much more temperate and fertile than it is today. There is a great deal of evidence (e.g. in ancient art, in archeological discoveries of ancient settlements, etc.) that Mesopotamia was once a grassland that could support both large herds of animals and abundant crops. Thus, between the water provided by the rivers and their tributaries, the temperate climate, and the prevalence of the plant and animal species in the area that were candidates for domestication, Mesopotamia was better suited to agriculture than practically any other region on the planet.
While the Tigris and Euphrates provided abundant water, they were highly unpredictable and given to periodic flooding. The southern region of Mesopotamia, Sumer, has an elevation decline of only 50 meters over about 500 kilometers of distance, meaning the riverbeds of both rivers would have shifted and spread out over the plains in the annual floods. Over time, the inhabitants of villages realized that they needed to work together to build larger-scale levees, canals, and dikes to protect against the floods. One theory regarding the origins of large-scale settlements is that, when enough villages got together to work on these hydrological systems, they needed some kind of leadership to direct the efforts, leading to systems of governance and administration. Thus, the earliest cities in the world may have been born not just out of agriculture, but out of the need to manage the natural resource of water.
The first settlements that straddled the line between “towns” and real “cities” existed around 4500 BCE, but a truly urban society in Mesopotamia was in place closer 3000 BCE, wherein a few dozen city-states managed the waters of the Tigris and Euphrates. A note on the chronology: The town of Catal Huyuk discussed in the last chapter existed over four thousand years before the first great cities in Mesopotamia. It is important to bear this in mind, because when in considering ancient history (in this case, in two short chapters of a textbook), it can seem like it all happened quite rapidly, that people discovered agriculture and soon they were building massive cities and developing advanced technology. That simply was not the case: compared to the hundreds of thousands of years preceding the discovery of agriculture, things moved “quickly,” but from the modern perspective, it took a very long time for things to change. In sum, Mesopotamian civilization was growing very, very slowly for thousands of years before the first great cities and empires arose.
The first true cities emerged in the southern region of Sumer. There, the two rivers join in a large delta that flows into the Persian Gulf. Farther up the rivers, the northern region of Mesopotamia was known as Akkad. The division is both geographical and lingual: ancient Sumerian is not related to any modern language, but the Akkadian family of languages was Semitic, related to modern languages like Arabic and Hebrew. Civilization flourished in both regions, starting in Sumer but quickly spreading north.
One early Sumerian city was Uruk, founded around 3500 BCE. By 2500 BCE, Uruk had about 50,000 people in the city itself and the surrounding region. It was a major center for long-distance trade, with its trade networks stretching all across the Middle East and as far east as the Indus river valley of India, with merchants relying on caravans of donkeys and the use of wheeled carts. Trade linked Mesopotamia and Anatolia (the region of present-day Turkey) as well. The economy of Uruk was what historians call “redistributive,” in which a central authority has the right to control all economic activity, essentially taxing all of it, and then re-distributing it as that authority sees fit. Practically speaking, this entailed the collection of foodstuffs and wealth by each city-state’s government, which then used it to “pay” (sometimes in daily allotments of food and beer) workers tasked with constructing walls, roads, temples, and palaces.
Political leaders in ancient Mesopotamia appear to have been drawn from both priesthoods and the warrior elite, with the two classes working closely together in governing the cities. Each Mesopotamian city was believed to be “owned” by a patron god, a deity that watched over it and would respond to prayers if they were properly made and accompanied by rituals and sacrifices. The priests of Uruk predicted the future and explained the present in terms of the will of the gods, and they claimed to be able to influence the gods through their rituals. They claimed all of the economic output of Uruk and its trade network because the city’s patron god “owned” the city, which justified the priesthood's control. They did not only tax the wealth, the crops, and the goods of the subjects of Uruk, but they also had a right to demand labor, obligating the common people (i.e. almost everyone) to work on the irrigation systems, the temples, and the other major public buildings.
Meanwhile, the first kings were almost certainly war leaders who led their city-states against rival city-states and against foreign invaders. They soon ascended to positions of political power in their cities, working with the priesthood to maintain control over the common people. The Mesopotamian priesthood endorsed the idea that the gods had chosen the kings to rule, a belief that quickly bled over into the idea that the kings were at least in part divine themselves. Kings had superseded priests as the rulers by about 3000 BCE, although in all cases kings were closely linked to the power of the priesthood. In fact, one of the earliest terms for “king” was ensis, meaning the representative of the god who “really” ruled the city. Thus, the typical early Mesopotamian city-state, right around 2500 BCE, was of a city-state engaged in long-distance trade, ruled by a king who worked closely with the city's priesthood and who frequently made war against his neighbors.