ocr: cultivators of marginal lands and the semisedentary tribespeople in the highlands north of the Valley of Mexico. As worsening conditions forced these peoples to move, the Teotihuacanos might have found themselves not only short of food but also under military pressure along their northern frontier. Whether or not climatic change was a factor, some signs of decline- such as the lowering of standards of construction and pottery making - are evident during the last century of Teotihuacan's existence. Both a reduction in population and a tendency toward dispersion suggest that the fabric of societ ...
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