For using money in the near future but not right away
As far as I know only the Chavin civilization (Chavin de Huantar in today's Peru) also constructed pyramids. Their pyramids were flat on top - likelt so that ceremonies can be performed there.
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Answer:
They made clothes for their families and boycotted British goods.
WW11 didn't happened yet. as well as ww3 - ww10
but real talk, do you mean ww2 (WWII) or just ww1?