22.3 trillion dollars last i looked is what americas gdp was.
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The imperial system was the closest to a modern economy in a closed system and it demonstrated well enough how wealth accumulated in the hands of a select few individuals at the expense of both the home nation and the colonies.
The old empires are actualy quite interesting to study from an economics standpoint, people would be surprised to find out just how broke the nations actualy were during that period despite how rich there upper class's were.