Mexico and Central America have plenty of ancient, monumental structures (e.g., Chichen Itza). But the continental US and Canada do not. Why?
In: Engineering
Complex societies that can create the necessary engineering and economy doesn’t happen before people figure out agriculture because without it, there’s no way of sustaining that many people in a small area. You need easier food production so that not every single person in a society has to produce food all day everyday and actually start doing other stuff, such as construction of giant things.
This just didn’t happen in Northern America to a necessary extent.
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