The increased attention given to food production and the management of land and resources resulting from settlement was accompanied by a growing territorial awareness and efforts to delineate, hold, and protect land. Furthermore, as the size of the population increased, it became necessary to expand the managed land, eventually encroaching on land managed by other groups, resulting in frequent inter-group conflict.
■References (Books, papers, Web articles, etc.)
『家族進化論』 第6章・第7節 農耕と牧畜がもたらしたもの 山極寿一 （東京大学出版会、2012）
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