America's First Megacity Was Bigger Than London!
Cahokia, a Native American city, was larger than London around 1100 CE.
Believe it or not, before Columbus arrived, North America had massive cities! Cahokia, near modern-day St. Louis, was the biggest pre-Columbian city north of Mexico.
Around the year 1100 CE, Cahokia covered about 6 square miles and had a population between 15,000 and 20,000 people.
That's as big as a major European city like London was at that time! They built huge earth mounds, like Monks Mound, which is the largest earthwork structure in the US!