century before Christopher Columbus set substructure in the Americas , a colossal urban center along the floodplain of the Mississippi River was buzzing along with its thousand upon thousands of residents . picayune of the grand metropolis continue today except for a sprinkling of grassy hills , known as the Cahokia Mounds .

Just a short drive from St Louis in Missouri , theCahokia Moundsare the cadaver of the largest pre - Columbian small town north of Mexico ( at least that modern - sidereal day archeologist bed about ) . It served as a vivacious economic hub of the Mississippian culture , which dominated the region from 800 to 1350 CE .

The liquidation reach its peak between 1050 and 1150 CE when it covered around 1,600 hectare ( 4,000 acres ) of land . estimate vary , but it ’s believed it held a universe of somewhere between 10,000 to 50,000 people .

Artists illustration of how the Cahokia Mounds Site might once appeared around 1,000 years ago.

Artist’s illustration of how the Cahokia Mounds site might have appeared around 1,000 years ago.Image credit:Herb Roe/Wikimedia Commons(CC BY-SA 4.0)

Around 51 of the village ’s original 120 earthen mounds still stand today . The most large is the so - called Monks Mound , the great prehistorical earthen structure in the whole of the Americas .

This large platform mound rises in four terrace to a height of 30 meters ( 98 base ) . It was constructed using hatful of soil and mud packed on top of each other until they organize a outrageous mound . In its prime , it in all likelihood fend more just , but the slopes have slumped over the 100 . Some researchers have argued that Monks Mound might have acquire as long as 250 years to amply build , butmore recent evidencesuggests its construction could have been potential within just 20 years .

While not as mighty as theGreat Pyramid of Gizain their size of it or grandeur , it ’s worth remember that these cumulation were manufacture without wheels , metallic element tools , or beasts of burden like horse or cows .

Cahokia also featured an astronomic observatory , known as “ Woodhenge ” , made up of wooden billet evenly space around a rope like bit on a clock . Archaeologistsbelievethis structure was aligned to the position of the Sun in the sky during the summertime solstice and the winter solstice , as well as the springtime and fall equinoctial point .

Some believe this urban center was already deserted and left to ruin by the timeEuropean coloniser arrivedon American grunge in the fifteenth century CE . The understanding for its premature dying is not agreed upon but there are a range of theories , ranging from drought andpersistent floodingto state of war andsocial collapse .

However , astudy in 2020argued the story of Cahokia ’s gloaming is n’t as clear - stinger . They found grounds that the Native Americans repopulated the neighborhood in the 16th century CE and preserve a unshakable presence there through the eighteenth hundred .

" One would think the Cahokia region was a spectre town at the sentence of European contact , based on the archeological platter , but we were able to piece together a Native American presence in the area that endured for centuries , " AJ White , direct generator of the 2020 discipline and UC Berkeley doctorial bookman in anthropology , aver in astatement .

“ There ’s very little archaeological evidence for an Indigenous population past Cahokia , but we were able to satiate in the gaps through historical , climatic , and bionomic information , and the linchpin was the faecal stanol evidence , ” White added .

" The story of Cahokia was a lot more complex than , ' Goodbye , Native Americans . Hello , Europeans ' . "