https://www.jetpunk.com/users/quizmaster/charts/population-of-rome-over-time https://www.jetpunk.com/users/quizmaster/charts/population-o... Rome's population

https://www.jetpunk.com/users/quizmaster/charts/population-of-rome-over-time https://www.jetpunk.com/users/quizmaster/charts/population-o... Rome's population collapsed dramatically after the fall of the empire, by the medieval period, Rome's population was 20,000. Even London didn't exceed 100,000 until the 17th century and most European towns were small villages with a few hundred to a few thousand at most. By my reading of history, the Americas were relatively better off than Europe for much of the dark and middle ages, in average health, height and even lifespan. They were probably at least as populous as Europe if not moreso. Teotihuacan was one of the largest cities in the world for much of the last 2000 years. Modern day Mexico City (25 mi from where Teotihuacan was) has 9 million to this day. There are also massive ruins of cities in the Amazon for which we know very little about from this era. The biodiversity is also incredible in the Amazon, so there could feasibly be many zoonotic diseases in those jungles. I'm partly playing devil's advocate here, I do think the racial diversity and intercontinental exchange in the old world contributed to it.