While the earliest agricultural tools are known from beneath Jericho, approximately 7000 BC, further signs of civilization and tool making quickly cropped up across the Zagros mountain range.
The Halaf civilization (estimates vary but generally run either from 6100-5100 BC or 5100-4100 BC) is known from a number of different locations, primarily in Syria where pottery has been found. The different types of designs found in specific locations especially Tel Sabi Abyad) seem to indicate a significant trade, or possibly migration from the surrounding mountains. During the Halaf period, a variety of grains and herbs (including barley, emmer wheat, einkorn wheat, free threshing wheat,oats, hawthorne, crosswort flax, lentils, legumes, cornelian cherry, clover, sweet clover, fleawort, field peas, linseed, wild olive, pistachio, grape, fig and hawthorn were commonly found at the archaeological site at Ras Shamra in northwest Syria.
Halaf pottery has been found as far as the earliest cities in Sumer.
Mesopotamia (modern Iraq) was home to the world's first truly urban cultures -- societies featuring permanent cities whose populations were fed from the surrounding countryside, but themselves engaged in other activities besides agriculture, such as trade, specialist crafts and record-keeping. From 4000 to 3000 BC, the Sumerians established some of the first known cities in the then-moist land of Sumer (modern southern Iraq, called Ki-en-gir by the Sumerians). It is not currently known with certainty where the Sumerians came from, but immigration from elsewhere seems probable; their myths suggested a seafaring background. From an anthropological viewpoint Sumerians belonged to the Caucasian, Mediterranean, Balkan European race.
Historians speculate that the first Sumerian settlers may have been driven by overpopulation or conflict, as Sumeria was superficially inhospitable to stone-age man; it lacked the stones needed in Neolithic life to make most tools. However, the early Sumerians discovered that mud could be dried and used as a building material, and the soil was rich in clay to use to make farm tools. Once the Sumerians began to plant, they realized that Sumeria's rich mud yielded far greater quantities of food than they could consume. This surplus resulted in some of the first known exports in history.
Situated near the head of the Persian Gulf, Sumer was well-positioned for sea trade, as well as having land connections to neighbouring Anatolia and Elam (modern southern Iran), both of which harboured simpler cultures. The early Sumerians began to trade their surplus grain with their neighbours for the items that Sumeria did not have, such as livestock and stone. This influx of goods (and therefore merchants) gave rise to some of the first true cities. Sumerian cities spoke the same language and worshipped the same gods. However, they were not one, with whole cities being burnt to the ground in their inter-city warfare. A typical run-of-the-mill city-state consisted of the city proper and much of the country-side around it. Early Sumerian government was strictly theocratic, and governed everything from sacrifices to taxation to irrigation. Therefore, the central point of each city was its great platform/ziggurat in the centre. These ziggurats became the main form of the later Babylonian monument architecture in the same region.
Writing in its strictest sense was first invented and used by the Mesopotamians around 3100 BC. It evolved out of a Mesopotamian trade tradition. When two merchants made an agreement, they would make clay models of the items being traded and then would seal them in a clay ball. However, if one of the merchants wanted to double check the quantities agreed upon in the contract, the merchants would need to break open the clay ball, literally breaking the contract. Therefore, the merchants began to scratch little picture of the items onto the outside of the clay ball. Eventually someone realized that the ball and models were no longer necessary. Later the Sumerians created more symbols for use in writing down laws and eventually even stories. This form of writing was called cuneiform.
As many as a thousand clay tablets were found in the Uruk archaeological layer dating to the 30th century B.C. From Sumer, cuneiform script and civilization spread to all the peoples of Asia Minor (Assyrians, Hittites, Urartuans, etc). For instance, the ancient Asomtavruli alphabet of the modern Georgian language has ethno-cultural contacts with the Sumerian world. Georgian specialists study the similarity of Sumerian and Iberian-Caucasian languages. Sumerian remained the language of religion and science as the 2nd-1st millenium B.C. before its replacement by Semitic languages. But Sumerian did not confide the Semites with the Majuscule alphabet, the secret spiritual alphabet that has a lot of similarity to ancient Georgian Asomtavruli alphabet. More than 200 Sumerian and Svanian terms are identical both phonetically and semantically. Sumerians created new simplified 22 simple letter-signs alphabet. The Semitic alphabet created by Sumerian scientists for Accadians laid the foundation for various people's writing creation and spreading (Moabs, Phoenicians, Hebrews, Greeks, Latins, Arabs and others) Sumerian sacral alphabet of 35 letter signs that concealed the Sun and the Moon calendar.
After flourishing for the better part of a millennium, Mesopotamia apparently experienced a climate change, which led to drought, exhaustion of the heavily-used soil, agricultural failure, and the decline of the Sumerian city-states that had become dependent on reliable surplus food production. Neighbouring peoples and tribes launched military incursions against the weakened city-states, resulting in political power shifts and the rise of new states and cities further north. Sumerologist Samuel Noah Kramer wrote "in the last quarter of the 3rd millennium B.C. the Semites inhabiting the town of Akkad conquered Sumer and made the Sumerian scientists create an alphabet for them, which subsequently came to be called the Semitic" This event took place in 2125 B.C.