I’m always astonished at the range and diversity of trade in the ancient world. There have been some amazing finds in the Americas, too: goods that traveled almost unbelievable distances, trade among civilizations most people never hear about.
I wholeheartedly agree. It is evident that there was long-distance trade in the Americas. The apparent quantity of copper mined in the Upper Peninsula of Michigan in precolumbian times was mystifying for a long time -- Menzies posits Isle Royale and the UP as the source for the copper used in the European bronze age -- but it turns out that the copper moved out and south into Central America. This doesn't mean there wasn't precolumbian contact, of course.