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Ceramic trade goods involved interconnected markets from Mexico City to Mesa Verde, Colorado. Shells from the Gulf of California, tropical bird feathers from the Gulf Coast area of Mexico, obsidian from Durango, Mexico, and flint from Texas were all found in the ruins of Casa Grande (Arizona), the commercial center of the northern frontier.
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Roxanne Dunbar-Ortiz (An Indigenous Peoples' History of the United States (ReVisioning American History, #3))