Nº 49
Cahokia - the American City That Rivaled London
Around 1100, the biggest city north of Mexico wasn't in Europe. It was here - on the Mississippi - and it rivaled London itself.
Quick - the biggest city in North America around the year 1100? Not Boston, not New York; they didn't exist yet. It was Cahokia, on the Mississippi, right across from modern St. Louis. And it rivaled London.
This wasn't a village. Archaeologists estimate Cahokia's peak at roughly ten to twenty thousand people - some estimates run up to forty thousand. A planned Indigenous city, laid out on purpose.
Mississippian - not Aztec, not Maya
It was built by the Mississippian culture. Not Aztec, not Maya - their own civilization, in what's now Illinois, with plazas, neighborhoods, and a giant grand plaza at its heart.
Monks Mound - a hundred feet of hand-piled earth
At its center stood Monks Mound - about a hundred feet of hand-piled earth, the largest ancient earthwork north of Mexico. It covers a bigger footprint at its base than the Great Pyramid of Giza. Built by hand, basket by basket.
The honest part - say it right
Here's where we stay careful. At that moment, London held maybe twenty thousand people too. So the honest way to say it is that Cahokia was comparable to - and at times larger than - contemporary London. The comparison holds against London of the same era, the 12th century. It does not hold against London around 1250–1300, which had grown to eighty or a hundred thousand. So we date it to ~1100, and we never claim it was "bigger than London in 1250."
A UNESCO World Heritage city, built basket by basket, standing here before Europe arrived. Mexican by name. American by history.
| Claim | Confidence | Sources |
|---|---|---|
| Cahokia (near modern St. Louis, in present-day Illinois) was the largest Mississippian settlement and the largest city in North America north of Mexico, peaking c. 1050–1150 CE. Culture is Mississippian - not Aztec or Maya. | Solid | Cahokia - Wikipedia · EBSCO Research Starters - Cahokia Becomes the First North American City · UNESCO WHC #198 - Cahokia Mounds |
| Peak population estimates range widely: commonly ~10,000–20,000, with some estimates up to ~40,000 (and low ends near 6,000–8,000). Always stated as an attributed range, never a single hard figure; scholars debate the density method. | Solid | Cahokia - Wikipedia (6,000–40,000; 2007 study 10,200–15,300 central) · EBSCO (8,000–40,000+, most 10,000–20,000) |
| Monks Mound is the largest pre-Columbian earthen construction in the Americas north of Mexico, ~100 ft (30 m) tall on multiple terraces, with a footprint larger at the base than the Great Pyramid of Giza. | Solid | Cahokia - Wikipedia (Monks Mound, 30 m, largest N of Mexico) · UNESCO WHC #198 |
| "Bigger than London": Cahokia's 12th-century population may have been larger than contemporaneous London and Paris. This holds vs. 11th–12th-century London (~18,000–25,000) - NOT vs. London c. 1250–1300, which had grown to ~80,000–100,000. Frame as "comparable to / at times larger than contemporary London." | Myth-corrected | Cahokia - Wikipedia ("larger than contemporaneous London and Paris") · Norman and medieval London - Wikipedia (London ~18,000 in 1070s; 80,000–100,000 by ~1300) |
| Cahokia Mounds is a UNESCO World Heritage Site (inscribed 1982). | Solid | UNESCO WHC #198 - Cahokia Mounds State Historic Site · Cahokia - Wikipedia |
