11 Richest Empires in Ancient History (msn.com)
After hunter-gatherers became farmers and farming gave rise to cities, cities gave rise to empires. They grew through military conquest, were built by slaves, and were maintained with brutal violence, but the great empires also unified millions of far-flung people under a common culture and gave rise to incredible technology and innovation.
https://www.gobankingrates.com/
Mws R Writings 