Ancient Americans developed advanced copper working before the rest of the world.
As documented in Ages of the Giants, prehistoric people in America were fabricating sophisticated spear points and other useful objects from copper by 6,000 B.C.
Three thousand years later Western European finally got around to making simple copper beads.
With this early start at metallurgy, it is no surprise that by Hopewell times (200 B.C.), the Indians were creating truly fantastic copper effigies, head plates, and geometric designs.