[jessep]

I know this is pedantic, but I think your point applies to 10,000 years ago :) 1000 years ago many empires had already risen and fallen in China and it was a centralized agricultural civilization. Not an expert.

Also fall of civilizations podcast is awesome!

Here’s a timeline of dynasties.

https://www.metmuseum.org/toah/hd/chem/hd_chem.htm