ocr: most other Middle American civilizations- urban and nonurban- -down to the time of the Aztecs. It is hard to say exactly why this happened, but at least some of the contrib- uting factors are evident. The archaeological record suggests the following sequence of events. A settlement of moderate size existed at Teotihuacan fairly early in the first century B.C. At about the same time, a number of neighboring religious centers were flourish- ing. One was Cuicuilco, to the southwest of Teotihuacan in the Valley of Mexico; another was Cholula, to the east in the Valley of Puebla. The most important ...
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