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
There are.
Poverty Point (Louisiana, US): https://en.m.wikipedia.org/wiki/Poverty_Point
Mississippian earth mounds (Southeastern US): https://www.nps.gov/ocmu/learn/historyculture/mississippian-culture.htm
Hopewell earthworks (Ohio, US): https://www.nps.gov/hocu/learn/historyculture/hopewell-ceremonial-earthworks.htm
Building these immense structures required sophisticated math and engineering, as well as the organization of thousands of laborers. People traveled to these sites from hundreds of miles away for cultural gatherings. These sites are no less impressive or significant than any other such monumental constructions around the world.
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