What kinds of evidence do they use to write Indigenous history?

How do Voegelin and Kroeber define ethnohistory as a field? How do they define Indigenous political structures and territory? What kinds of evidence do they use to write Indigenous history? Based on these readings, how does an anthropologist’s approach to Indigenous history differ from a historian’s? Turning to Deloria’s essay, what does he criticize about the research methods and goals of anthropologists?