Reyes Family - mulatos from Sombrerete, Zacatecas in the 1700s

I'm not sure if I should post this in Genealogy Research or History, Culture and General Discussion:

I finally found my African roots. Reading the records I have traced my mulato ancestors to the Reyes Family out of Sombrerete - specifically "Real de Sombrerete, Zacatecas, Mexico". This branch of my family seems to have intermarried with the Salas, C/S/Zervantes and Hernandes families from Pinos, Zacatecas and Mezquital, Durango.

Does anyone know anything about Africans in Zacatecas in the 1700s and early 1800s?