Hot answers tagged aztec
The architecture you want to investigate is the step-pyramid. In short, it's the easiest way to build very tall structures with a lot of manpower and natural resources, but not a lot of architectural sophistication. As a civilization progresses, its architectural sophistication increases, leading to very different structures - the smooth sided Egyptian ...
I find the claim dubious, or at least incomplete. Google reveals multiple citations to Aztec use of cocoa beans (I think the Bank of Belgium is among the best) as commodity currency, and none to feathers in the same role. I would have expected at least one mention of the alternative commodity currencies.
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