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I based this off a similar thread in the After 1900 forum.

So I was thinking about the city of Rome and how at around 100 BC-300 AD the city sported a population of around a million people. This population was largely limited by technology and the surrounding terrain.

So my question is this: if a culture with Roman levels of technology settled anywhere in the world, how potentially large could a city become? For example, lets say a civilization as advanced as Rome pops up near where modern day Seattle is currently located. How large could a city built there become with so much in the way of resources?

This POD would have to start pretty early, but we are talking ancient times, so a POD starting in ancient Egypt would allow plenty to happen by 300 AD. The culture that advances like this doesn't have to be Roman, it just has to have such levels of technology. It could easily be a native american culture seeing as amazing things did happen in Central America or if this city is being built elsewhere, it could be in India or China or Africa.
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