Title: A plague of sheep
Subjects: Animal introduction, Ecology, Environmental aspects of Animal introduction, Environmental aspects of Grazing, Environmental aspects of Pastoral systems, Environmental conditions, Grazing, History, Human ecology, Indians of Mexico, Pastoral systems, Sheep, Indians of mexico, history, Mexico, history, to 1810, Latin america, history, Mouton, Écologie, Histoire, Animaux, Introduction, Aspect de l'environnement, Pâturages, Pastoralisme, Écologie humaine, Indiens, Environnement, 15.85 history of America, Environmental aspects, Ackerbau, Eroberung Mexikos, Umweltkrise, Weidetiere, Ecologische aspecten, Veroveringen, Environmental degradation, Systèmes agraires, Élevage, Eroberung
Places: Mexico, Mezquital Valley (Hidalgo), Mezquital Valley (Hidalgo, Mexico)
Time periods: 16th century, Conquest, 1519-1540, Spanish colony, 1540-1810