The American midwestern city of Cahokia around 1100 was larger than some European cities. The Euro city most often compared is London.
Cahokia is (was) across the river from St Louis and is on the way for many west ward vacations. A visit is advised on trips to Yellowstone et al.
It had it’s own henge...... a complex structure of wood used for archeo astronomical observations. Population estimates vary but top out around 25,000
I have read several articles about this. Are you saying it was built by Africans or Phoenicians?