re: Sure, the wheel was a great invention, but it seems such obvious technology

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And that's why it was never a part of New World civilization.

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Nice try, Rex, but producing wheels wasn't the problem.

The New Worlders actually did have some concept of the wheel. You can find it on toys and trinkets dating back to pre-Columbian times.

The problem is that without large animals to domesticate in the New World, there's really not a lot of carts, chariots, etc. being built. So there's no progression up from initial discovery.

They just used sleds, rollers and human power instead.