Which valuable item was heavily traded between Native Americans and settlers in the Midwest-Great Lakes region?

In the Midwest-Great Lakes region, fur, particularly beaver pelts, was a valuable item heavily traded between Native Americans and settlers. The fur trade became a significant economic driver in the area, with European settlers relying on Native American knowledge and networks to source these pelts. This trade not only facilitated economic exchanges but also led to profound cultural interactions and conflicts between the two groups.