Based in southern Ohio, the Hopewell interaction sphere lasted until about 400 A.D. and extended across two-thirds of what is now the United States. Into the Midwest came seashells from the Gulf of Mexico, silver from Ontario, fossil shark’s teeth from Chesapeake Bay, and obsidian from Yellowstone. In return the Hopewell exported ideas: the bow and arrow, monumental earthworks, fired pottery (Adena pots were not put into kilns), and, probably most important, the Hopewell religion.
