When historians ask questions about variations across different groups of people with common traditions, they gather information from

Cultural anthropologists

Explanation:

When historians ask questions about variations across different groups of people with common traditions, they gather information from cultural anthropologists. Cultural anthropology is a branch of anthropology that focuses on the study of cultural variation among humans. Therefore, these type of scholars look at the different cultures that make up humanity and study their differences and similarities.

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rosevelt. 1973. "slaves everywhere"