On the other hand, before 3-4000 years ago, the largest "city" in the world probably wasn't even 100,000 people. So you go back far enough anywhere and the citi

On the other hand, before 3-4000 years ago, the largest "city" in the world probably wasn't even 100,000 people. So you go back far enough anywhere and the cities were more like villages if that. It's interesting that the biggest cities plateaued at about 1 million from about 100 BCE to 1800 CE, until the industrial revolution kicked in.