A new study published in the Journal of Archaeological Science has utilized lead isotope analysis to prove that copper artifacts found in Ohio's Hopewell mounds originated from mines in the Lake Superior region, over 1,000 kilometers away. The research confirms the existence of a massive, coordinated trans-continental trade network that operated in North America between 200 BCE and 500 CE.
The findings suggest that ancient Indigenous peoples had established complex territorial agreements and specialized mining operations long before European contact. The study also identified obsidian from the Rocky Mountains and shells from the Gulf of Mexico within the same cultural layers, highlighting the Hopewell sites as central hubs for continental exchange. This research shifts the narrative of North American history toward a more interconnected and economically sophisticated past.