Pizzigoni brings indigenous-language social history into the later colonial period, whereas the emphasis until now has fallen heavily on the earlier phase. The late seventeenth and eighteenth centuries emerge as a dynamic time that saw, along with cultural persistence, many new adaptations and creations. Covering a period of over a century and a half, this study goes beyond a monolithic treatment of the region to introduce for the first time a systematic analysis of subregional variation in vocabulary and real-life phenomena, showing how, within larger regional trends, each tiniest community of the Toluca Valley retained markers of its individuality.