East St. Louis Used to Be an Ancient City with Pyramids

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They built a huge community that covered 6 square miles for a population of up to 30,000 people, and included a thousand thatched-roof houses, 120 earthen mounds, and a dozen pyramids. If you were traveling down the Mississippi River, you would have seen these pyramids and temples at quite a distance. Despite that this civilization had no written language, they were accomplished architects and construction workers who built a variety of structures like houses, temples, meeting halls and public works.
Source: saintcharlesroofing.com