What aspect of Julian Steward and Sidney Mintz's work introduced a new approach to ethnography?

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Julian Steward and Sidney Mintz's collaborative, multi-sited research on the effects of colonialism in Puerto Rico introduced a new approach to ethnography. This approach involved studying a single topic across multiple sites and collaborating with local researchers to gain a more complete understanding of the topic. This approach allowed for a more nuanced understanding of the impact of colonialism on different communities and helped challenge the dominant narratives about colonialism at the time.

What Aspect of Julian Steward and Sidney Mintz's Work Introduced