China is like a modern Roman empire. Masters of civil engineering.
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Yup, similar number of slaves too.
https://en.wikipedia.org/wiki/Demography_of_the_Roman_Empire
https://www.walkfree.org/global-slavery-index/country-studie...
That website has the US at 3.3 slaves per thousand people compared to China's 4.0.
You're catching on.