Groups which were in competition for foraging range bumped against each other after thousands of years of population expansion.
Groups of early modern humans found themselves hemmed around by other groups, with the result that movement to other ranges nearby may have been restricted, in any direction, by conflict. So changing hunter gatherer range perhaps ceased to be feasible physically.
The central criterion for a liveable sedentary range, anywhere, was access to water.
Water was the key to a feasible place for a settlement, in the first instance, a place to be able to defend from neighbors. It could be a section of a stream bank, a spring, a lake. It probably was not in the first instance a high place because of the scarcity of water in such a place, and also probably the relative scarcity of surrounding food grains on hilly or rocky terrain.
The second requirement was, as Wade describes, the existence of edible grasses in the nearby surrounding area, prior to the development of agriculture.
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