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The percent of cities and towns in a given period that persist from a prior period (backward continuity) and the percent that persist into a later period (forward continuity) are known to correlate positively with economic and political stability in a region. Researchers studying demographic trends in the Indigenous societies of ancient Mexico determined both continuity measures for the Yautepec Valley, which lay within the macroregional hegemony of the city-state of Teotihuacan from roughly 100 BCE until roughly 450 CE, after which point Teotihuacan declined. The team concluded that ______