9,000-Year-Old Stonehenge-Like Structure Found Under Lake Michigan
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https://www.nps.gov/articles/000/archaeological-history-ancient-copper-mining.htm
https://eos.org/articles/miners-left-pollution-trail-great-lakes-6000-years-ago
Where did the Kemet get it's copper to make bronze?
Why did DeSoto go look and how did he find them?
Hidden history