4.5 Sumarians
It was the Sumerians who played the key role in this emergence. They lived in a political framework quite unlike that of ancient Egypt.   Instead of forming a unified kingdom, they were divided into some thirty city-states. After a millennium or so the Sumerians themselves faded away.  They were no doubt assimilated by their neighbours. But by then their civilization had been adopted by other peoples, notably the Akkadians to their northwest. The Sumarian traditions were to determine the culture of Mesopotamia down to the second half of the first millennium B.C.
Since Mesopotamian civilization, like that of Egypt, was fated to die out, none of its literary remains have been transmitted to us directly. As with ancient Egypt, we derive most of what we know from chance finds or archaeology.
In the Egyptian case our main debt is to the desert conditions that have preserved large quantities of ancient papyrus. In the Mesopotamia the prime material used by cuneiform scribes was clay. Once fired, whether deliberately or by accident, clay tablets can survive as well as pottery can. The result is to give us a fragmentary, but very diverse, body of ancient Mesopotamian sources. Much of it is the product of more or less meticulous administration, but there is also material of many other kinds, including the Gilgamesh epic a textual tradition of considerable literary merit.
In political terms this civilization never did develop a tradition of a unitary Mesopotamian state. There was, however, a tendency for the scale of political organization to increase over time. In the third millennium B.C. city-states were the norm, while an imperial episode in the twenty-fourth and twenty-third centuries was the exception.  By the first millennium B.C. the city-states were gone, and empires like those of the Assyrians and Babylonians had replaced them.
Mesopotamian civilization was more influential than that of ancient Egypt. Indeed, it is likely that Mesopotamian influences played some part in the formation of the nearby civilizations of Egypt and the Indus Valley. But a more general influence was the adoption by other peoples of the literary culture created by the Sumerians. Already in the third millennium the neighboring Akkadians had done this, as had the people of Ebla in northern Syria. The Hittites of Anatolia adopted Sumarian culture from the second millennium. They adopted the Sumerian literary tradition, with the result that Sumerian became the world's first classical language, which was still used by the educated long after it had died out as a language of everyday life. And at the same time they adapted the cuneiform script to the writing of their own languages, thus giving us our earliest direct knowledge of the Semitic and Indo-European language families-Akkadian for Semitic, and Hittite for Indo- European.