Cahokia’s 1050 rebuild, Monks Mound expansion and abandonment by about 1350

October 31, 2026USAGeneralShare

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Key facts

• Around 1050 CE, Cahokia’s built environment was reorganized: houses were rebuilt as uniform rectangular structures with grass roofs and a large central plaza was laid out.
• Monks Mound was built in four stages from about 900 to 1300 CE. It is about 100 feet high, covers roughly 17 acres and had a major building complex on its summit.
• Cahokia’s population is generally estimated at 10,000–20,000 at its peak around 1050–1200. The metropolis covered about six square miles, while the modern historic-site core covers roughly 555 acres.
• The central palisade was first constructed around 1200 CE, enclosed about 500 acres and was rebuilt several times through the 13th and early 14th centuries. It was roughly two miles long and used about 20,000 trunks, each 10–12 feet tall.
• New residential construction largely ceased after about 1200, but palisade work and repair continued. Cahokia remained occupied until about 1350, when it was largely abandoned.
• No evidence links the decline to an attack or an increase in skeletal trauma, so its cause remains unknown. The video argues that some Cahokians joined growing Mississippian communities in Alabama and Oklahoma.
• The SECC’s mounds, elite residences, palisades and iconography influenced later Mississippian centers. The video argues that large-scale mass sacrifice did not spread.

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