The question is, obviously, Why? The standard explanation in the Sumerian case has been the gradual infiltration of pastoralists from the surrounding deserts who, presumably, always had more patriarchal mores. There was, after all, only a narrow strip of land along the Tigris and Euphrates rivers that could support intensive irrigation, and hence, urban life. Civilization was thus from early times surrounded by a fringe of desert people, who lived much like those described in Genesis and spoke the same Semitic languages. It is undeniably true that, over the course of time, the Sumerian
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