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Early Americans’ huge earthworks show off their engineering might
Analysis of mysterious earth mounds reveals their rapid construction and sophisticated composition.
On the banks of a Louisiana bayou, the Native American earthwork complex called Poverty Point includes one of the largest earthen mounds in North America, and other enormous monuments: a feat of construction that was unrivalled for more than 2,000 years. Analysis of one structure now shows that it was built with speed, perhaps even in only a few weeks.