One can never know enough history

I guess there were wheels in the Americas before the Europeans arrived. These people say so and they point to evidence of toys with wheels that archeologists have found in the Americas.

I went searching because there is no mention of wheels in Nathan Nunn and Nancy Qian's "The Columbian Exchange: A History of Disease, Food and Ideas." In any case, their research is fascinating. If you are enjoying globalization via the World Cup (or at your local restaurant), read their paper. Then read Charles Mann's 1491.