alt Hacker NewsWhat a bunch of nonsense. I really urge you to look into more contemporary research on it.
By which measure were they less advanced? Tenochtitlan had a population of north of 200k when the Spanish arrived - bigger than most European cities at that time, bar a couple. When you read the chronicles of the conquistadores you realise how advanced they were in many ways compared with Europeans.
Th Maya were contemporary to and very similar to Greece in many ways - definitely more advanced in some aspects of mathematics and astronomy, and had an extremely complex architecture.
The gap wasn’t so big, and in some cases American cities were even more advanced - probably the complex sanitation system of most mesoamerican cities contributed to the biggest asymmetry of all - European cities were a Petri dish of filth and disease.
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Ironically it was that Petri dish of filth and disease which gave the Europeans their largest (unintentional) military advantage in the New World. Of course the horses and steel weapons were also a factor.
Europe was technologically advanced but lacked in state capacity. The Aztecs and the Maya were the opposite.
Sanitation is a literal stone age technology, originally developed by societies we have very little evidence of. It doesn't require technological sophistication — only a government capable of and willing to administer it.
European middle ages were characterized by the lack of state capacity. Cities and trade declined after the fall of the West Roman Empire. Governments became weak and incapable, and the society was structured around regional warlords and their personal relationships. But technology kept moving on. While European societies had limited resources, they could do things their more capable predecessors could not.
And then, towards the end of the middle ages, states started consolidating again.