How do archaeologists know Poverty Point was a major trade center?

Archaeologists identify Poverty Point culture by its characteristic artifacts and the nonlocal rocks used to make them. Imported rocks and minerals include various cherts and flints, soapstone, hematite, magnetite, slate, galena, copper, and many others.Many artifacts from places far away were found at Poverty Point. This shows that people came and traded objects and they had some that were left.

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