ocr: weaknesses. Once such a process of deterioration passed a critical point, the city would have become quite vulnerable to attack. No evidence has been found that Teotihuacan as a whole had formal defenses. Nonetheless, the drainage pattern of the surrounding valley provides some natural barriers; large parts ofthe city were surrounded by walls or massive platforms, and its buildings were formidable ready- made fortresses. Perhaps the metropolis was comparatively unprotected because it had enjoyed an unchallenged supremacy for sO long. 400f42 à 1 o - - e contents
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