Originally posted by molly bloom
An ice age that also would have affected Europe and Asia- and yet domestication of the Eurasian horse was vital to the expansion of several empires. I don't see an ice age killing off just the horse and not a large swathe of other creatures- besides which, the ice sheets/glaciers presumably wouldn't have covered the whole of the North American continent.
An ice age that also would have affected Europe and Asia- and yet domestication of the Eurasian horse was vital to the expansion of several empires. I don't see an ice age killing off just the horse and not a large swathe of other creatures- besides which, the ice sheets/glaciers presumably wouldn't have covered the whole of the North American continent.
In any case, the Aztecs and other Mesoamerican cultures had 'wheel' calendars and wheeled toys, and pottery 'wheels'. They knew of the concept of the wheel, and yet had no beasts of burden to harness wheel power.

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