Hunter-gatherers in Louisiana raised earthworks before Egypt built its pyramids
Archaeologists long assumed that only farming societies with food surpluses could organise monumental building. Then radiocarbon dates from Watson Brake in northern Louisiana came back at around 3500 BCE. Seasonal foragers living on fish and deer had piled up eleven mounds there, working on them across roughly five centuries, long before anyone stacked a stone pyramid in Egypt.
'Mound Builders' is a loose label rather than one people. It covers many Indigenous cultures of eastern North America who shaped earth into monuments over more than 5,000 years, from the Great Lakes and the Ohio Valley down through the Mississippi basin to Florida. Their works included flat-topped platforms, rounded cones, long ridges and animal outlines, usually built as part of larger villages and used for burials and ceremonies.
Watson Brake sits in the floodplain of the Ouachita River. Its mounds range from about 3 to 25 feet high and are joined by ridges into an oval nearly 900 feet across. Dating it in the 1990s overturned the belief that pre-farming, pre-pottery societies lacked the organisation for such projects. Around 1500 BCE the people of Poverty Point, also in Louisiana, went further, laying six concentric crescent ridges over more than a square mile and trading far beyond their home region.
Later groups built on a grander social scale. The Adena and Hopewell cultures of the Woodland era raised geometric earthworks from Illinois to Ohio, and Serpent Mound in southern Ohio coils for more than 1,330 feet in the shape of a snake. From about 800 CE the Mississippian culture dominated, with its greatest centre at Cahokia, near modern Collinsville, Illinois. Its Monks Mound stands over 100 feet tall, the largest pre-Columbian earthwork north of Mexico, and around 1150 the city held perhaps 20,000 to 30,000 people.
Europeans arrived while the tradition still lived. Hernando de Soto's expedition described fortified mound towns between 1540 and 1542, and a ruler known as the Lady of Cofitachequi told him her mounds held the graves of nobles. French observers later watched the Natchez, whose paramount chief, the Great Sun, lived atop the highest mound and greeted the sunrise each morning with tobacco smoke.
Source: Mound Builders
