The United States’ oldest great civilization: Cahokia?


When we studied Native American history in school, we learned about many tribes. Chances are you don’t remember learning of Cahokia, a long-extinct civilization originally near what is now Collinsville, Illinois. First established around AD 600 and inhabited by a unique indigenous people, Cahokia was a civilization comprised of about 50 communities over 2,200 acres.

They built 120 earth mounds – some over ten stories tall – in the largest prehistoric earthen construction site north of Mexico. The Cahokians were advanced people who did not appear to be related to any major known Native American tribes. By 1250, Cahokia’s population rivaled Paris and London; at its peak in 1300, Cahokia numbered an estimated 40,000 people. It wasn’t until 1800 that a modern U.S. city would finally surpass that number.

After 1300, the population declined for unknown reasons and the city would lie vacant for another century.


What makes Cahokia so fascinating is how little we know about it. Despite being advanced for a Native American people, they did not leave written records. Instead we have symbols on pottery, stone, and wood.

Since we have no Rosetta stone, much of the original city – including its name – is still unknown. The Cahokia name was actually given to the area in the late 1600s, named for the Native Americans that settled nearby many centuries later.

(Click thumbnails to enlarge)


Cahokia Mounds

The most striking feature of Cahokia is the earthen mounds. Experts believe thousands of workers moved an estimated 55 million cubic feet of earth over a span of several decades. The workers didn’t have complex technology or building techniques, so these weren’t exactly the pyramids of Egypt.

Laborers carried earth up each mound by hand in woven baskets, making multiple trips each day.

The largest is called Monks Mound and is assumed to have been the center of the Grand Plaza of Cahokia – the plaza itself occupying 40 acres. Monks Mound is 92 feet (28 m) high, 951 ft (290 m) long, 836 ft (255 m) wide, and covers 14 acres.

The top of Monks Mound had a large, flat reinforced area which historians believe was home to a massive 5,000 square-foot temple about 50 feet tall. This temple was thought to have been the residence of the paramount chief and was said to be visible from anywhere in Cahokia.

Of the 120 earthen mounds the Cahokians constructed, only 80 remain today. Unfortunately farming and industrialization of the area has taken its toll: an estimated 40 mounds have been leveled or razed over the last 200 years for various reasons.

Of the 40 since-razed mounds, 29 have been located by archaeologists.



The second most significant feature of Cahokia was the Woodhenge. Not as well-known as the English Woodhenge (2 miles from Stonehenge), the America version seemed to serve the same purpose. Archaeologists who discovered the Woodhenge noted the wood posts symbolized the earth and the four cardinal directions, with a pattern that seemed to follow the sun.

The Woodhenge was discovered adjacent to Monks Mound, and some time later another Woodhenge was discovered by Mound 72.

Cahokia’s Woodhenge

Cahokia wood henge


Mass Grave

Mound 72 might just be the most significant archaeological discovery at the site. During an excavation, human remains were discovered: a man in his 40s experts believe might have been an important Cahokian chief.

Below his burial site experts found more than 250 other skeletons, sixty percent of which are believed to have been sacrificial killings or ritual executions. This was estimated due to countless bodies missing hands and skulls, more than fifty 21 year-old women found in neatly-separated layers, and finally a mass burial grave with over 40 men and women who appear to have been violently killed.

In fact evidence supports some were alive when they were buried, attempting to claw their way out of the mass of dead bodies.

Excavations around Mound 34 have discovered an ancient Cahokia copper workshop. This is significant because prior to this discovery, experts did not definitively know how early copper technology starting appearing around the United States.


700 years after Cahokia and the land still appears exhausted



Perhaps the most mysterious part of Cahokia was how it came to end; historians simply don’t know. The primary hypotheses are erosion from over-hunting and deforestation, invasion from outside tribes, disease, or abandonment due to political collapse.

The civilization was thought to have prospered for nearly 800 years, and given how primitive farming techniques were at the time it’s no surprise the land was eventually exhausted. Trees would have been sparse and pollutants from centuries of crude copper operations would contaminate the surrounding soil, making any crops poisonous even before harvest.

Defeat through invasion was possible but less likely considering little has been found of battle, and no mass civilian graves have been discovered – something likely to be found had the entire population been killed during a siege.

Archaeologists in Cahokia


We may never know what happened to Cahokia, but given its important place in North America’s history it is important we don’t forget it.

Cahokia is one of only twenty-one UNESCO World Heritage Sites in the United States, and is the largest archaeological site in the country.

And to think so few have ever heard of it.


Satellite & Map: click here



  1. I am Canadian, and in our school system from grade 1-12 we learn extensively the history of North America and how it was colonized and how the Aboriginal people lives before colonization etc. etc. But I only just learned about Cahokia in University, as well as some other places like it scattered throughout North America. I was outraged, I feel like the government is STILL trying to convince us that the savage natives needed to be colonized by conveniently leaving out entire civilizations and only showing us the nomadic ones.

  2. This is an excellent post. I live about an hour north of this site and have visited it often (although it has been quite a while since my last visit – a fact I hope to rectify this summer). The mounds are truly amazing close-up as you just don’t realize the vastness of them until you standing on top of one and can see how far the man-made plateaus extend in all directions and how high up off the main ground level you are. There are a lot of exciting events held here during the summertime and are generally pretty affordable due to subsidies given by several different organizations. They are also usually interested in volunteer offers (or at least used to be last I was there).

  3. I found this website very interesting I have never heard of Cahokia before and I just watched the movie the new daughter which featured an ancient civilization burial mound so I did a google search and ended up here I’m going to do some research on wood henge and try to find out more about Cahokia

  4. Thank-you. Due to the fact that people like those writing these articles and taking pictures and travelling around to find what they can find, we are all a bit smarter, hopefully. I never trust any government anywhere, nor do I trust anyone that is in a position of “authority”. I will now try to find out more about this ancient civilization. I am in Canada, but the world being so small, all of it is my home.

  5. Ca·ho·kia \kə-ˈhō-kē-ə\
    I thought some people might be interested in pronunciation.
    I was raised by a step-father that was an anthropologist. I traveled this continent and half of Europe with him. He organized many trips to Cahokia for those in my home town, Highland, KS… mostly college and high school students. Ironically, it wasn’t until after his death that my husband and I visited Cahokia on our own.

  6. I actually learned about this in high school! I live in Oklahoma, and we had to learn about the Native American mound civilizations as a part of a required Oklahoma history class. Cahokia is actually not the only site of an ancient mound civilization, they can be found in many states along rivers. We actually have two sites here in Oklahoma, the Spiro mounds being the largest. There was actually a large number of mound cities located on rivers across the US, though I believe Cahokia was the largest. There is evidence that shows that the mound people traveled by riverboat to other cities across the country and traded! It was not only a civilized culture, but an advanced one! However, the mound civilizations only thrived during cool and fertile climates. Due to climate change, the civilization ultimately fell. The last recorded evidence of a mound civilization and the first recorded European encounter with a mound civilization was during the French colonization of Louisiana.

  7. To all you aspiring explorers of the past, we can never underestimate the desire of human kind to make life better for the next generation. This desire alone drove the development of humans to become organized, civilized, and technologised. Remember it is greed that holds us back and also drives us forward. it is the scale of advancement based on what we now have, (comfort) verses what we could have, a better way we must weigh as we move ever forward.

  8. put who wrote it i am doing history fair on it and i need this stuff put the bate it was wrote and the person who wrote it!!!

  9. There is a great book (2015) titled Medieval Mississippians – The Cahokian World, for all those interested in a good overview with many different voices (incl. native) on this topic. ISBN 9781938645327

  10. I am in 10 grade and I have a table group and we had to research things similar to this and I had this civilization to research and I am glad that this was the cite that work for me. Thanks Sometimes Interesting.

  11. I have to take exception to your photo labeled ” the still land still appears exhausted”. That is very irresponsible and VERY wrong. This area was farmed from the 1800s until the mid 20th century when the state of Illinois began buying the property for the state park. After the expanded excavations and discoveries, additional land was purchase. I you bothered to take photos from the top of the main mound, you would see considerable forest and ground cover. Also remember this is a state park, it is mowed, and generally landscaped to be low profile to direct focus to the major structures.

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