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In page Puebla:

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The Mixtec people who live in the south of Puebla are part of an ethnic group which are still the dominant indigenous group in an area that stretches over Puebla, Oaxaca and the mountains of Guerrero. They are the fourth largest indigenous group in Mexico. The Sierra Mixteca region in Puebla is part of the Mixteca Baja region, which crosses into parts of Oaxaca as well.[7] In the Mesoamerican period, the Mixtecs of Puebla dominated further north than they do now and archeologists classify “Mixteca-Puebla” art as distinct from other Mixtec arts and crafts.[8] There are an estimated 6,700 Mixtecs living in Puebla, however, many have emigrated out of traditional Mixtec areas into other parts of the state, Mexico City and even the United States to work.[9][10]