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Sumer (from Akkadian Šumeru; Sumerian ������ ki-en-ĝir15, approximately "land of the civilized lords" or "native land"[note 1])[1] was a civilization and historical region in southern Mesopotamia, modern Iraq during the Chalcolithic and Early Bronze Age. Although the earliest historical records in the region do not go back much further than ca. 2500 BC, modern historians have asserted that Sumer was first settled between ca. 4500 and 4000 BC by a non-Semitic people who possibly did not speak the Sumerian language (pointing to the names of cities, rivers, basic occupations, etc. as evidence).[2] These conjectured, prehistoric people are now called "proto-Euphrateans" or " Ubaidians",[3] and are theorized to have evolved from the Samarra culture of northern Mesopotamia.[4][5][6][7] The Ubaidians were the first civilizing force in Sumer, draining the marshes for agriculture, developing trade, and establishing industries, including weaving, leatherwork, metalwork, masonry, and pottery.[3] However, some, such as Piotr Michalowski and Gerd Steiner, contest the idea of a Proto-Euphratean language or one substrate language.
Sumerian civilization took form in the Uruk period (4th millennium BC), continuing into the Jemdat Nasr and Early Dynastic periods. It was conquered by the Semitic-speaking kings of the Akkadian Empire around 2270 BC (short chronology). Native Sumerian rule re-emerged for about a century in the third dynasty of Ur (Sumerian Renaissance) of the 21st to 20th centuries BC. The cities of Sumer were the first civilization to practice intensive, year-round agriculture, by perhaps c. 5000 BC showing the use of core agricultural techniques, including large-scale intensive cultivation of land, mono-cropping, organized irrigation, and the use of a specialized labour force. The surplus of storable food created by this economy allowed the population to settle in one place, instead of migrating after crops and grazing land. It also allowed for a much greater population density, and in turn required an extensive labour force and division of labour. Sumer was also the site of early development of writing, progressing from a stage of proto-writing in the mid 4th millennium BC to writing proper in the third millennium (see Jemdet Nasr period).
http://en.wikipedia.org/wiki/Sumer
