Cahokia Mounds (11 MS 2)Pursell 205 is the site of a Native American city (which existed 1050–1350 CE) directly across the Mississippi River from present-day St. Louis. The state archaeology park lies in south-western Illinois between East St. Louis and Collinsville. Cahokia Mounds Homepage; Map of the Site The park covers , or about , and contains about 80 manmade mounds, but the ancient city was much larger. At its apex around 1100 CE, the city covered about , included about 120 earthworks in a wide range of sizes, shapes, and functions, and had a population of between 15,000 and 20,000 people. "Nomination – Cahokia Mounds State Historic Site, Illinois", US World Heritage Sites, National Park Service, accessed May 3, 2012
Cahokia was the largest and most influential urban settlement of the Mississippian culture, which developed advanced societies across much of what is now the Central and the Southeastern United States, beginning around 1000 CE. WashingtonPost.com: Ancient Cahokia, Washington Post Today, the Cahokia Mounds are considered to be the largest and most complex archaeological site north of the great pre-Columbian cities in Mexico.
The city's original name is unknown. The mounds were later named after the Cahokia tribe, a historic Illiniwek people living in the area when the first French explorers arrived in the 17th century. As this was centuries after Cahokia was abandoned by its original inhabitants, the Cahokia tribe was not necessarily descended from the earlier Mississippian-era people. Most likely, multiple indigenous ethnic groups settled in the Cahokia Mounds area during the time of the city's apex.
Cahokia Mounds is a National Historic Landmark and a designated site for state protection. It is also one of the 26 UNESCO World Heritage Sites within the United States. The largest pre-Columbian earthen construction in the Americas north of Mexico, the site is open to the public and administered by the Illinois Historic Preservation Division and supported by the Cahokia Mounds Museum Society. In celebration of the 2018 Illinois state bicentennial, the Cahokia Mounds were selected as one of the Illinois 200 Great Places by the American Institute of Architects Illinois component (AIA Illinois). It was recognized by USA Today Travel magazine, as one of the selections for 'Illinois 25 Must See Places'.
Cahokia became the most important center for the Mississippian culture. This culture was expressed in settlements that ranged along major waterways across what is now the Midwest, Eastern, and Southeastern United States. Cahokia was located in a strategic position near the confluence of the Mississippi, Missouri River, and Illinois River rivers. It maintained trade links with communities as far away as the Great Lakes to the north and the Gulf Coast to the south, trading in such exotic items as copper, Mill Creek chert, shark teeth, and lightning whelk shells.
+ !Table !900–1050 CE !1050–1100 CE !1100–1200 CE !1200–1300 CE !1300–1600 CE | |||||
Archaeological Chronology | Terminal Late Woodland Period | Lohmann Phase | Stirling Phase | Moorehead Phase | Sand Prairie Phase |
Developments | Villages nucleate and grow in size. Eastern Agricultural Crops cultivated. Maize introduced. | Urbanization and non-local contacts increase. Religious rituals and administrative centers appear. Greater Cahokia precincts and upland villages in the Richland Complex settled. | Moundbuilding continues. As does religious administration in the hinterlands. A large conflagration in the East St. Louis precinct circa 1160–1170 CE marks the beginning of depopulation. | Upland villages are depopulated. The entire city's population contracts. Storage pits moved inside residences. Marked change in ceramic styles. Non-local contacts are maintained. | Population continues to decline. The city is abandoned by 1400 CE with brief Oneota reoccupation. |
Architectural record | Earliest earthen platforms. Villages organized around central feature as cosmograms. | Woodhenge, T-and-L-shaped structures, large circular and rectangular platform mounds, plazas, and causeways. | Continued construction of mounds. The first iteration of the central palisade is constructed circa 1175 CE. | Select mound construction. Termination of certain structures. Large rotundas and T-and-L-shaped structures are no longer constructed. The palisade is rebuilt. | Any possible small-scale mound construction ceases before 1400 CE. |
An extensive nucleated community sprawled across in Cahokia proper, with its beginnings at the end in the late 900s CE. By this time it seems a few thousand people were living in the American Bottom region. Moundbuilding activity may have occurred at Cahokia proper but certainly did at one site to the north near Horseshoe Lake. These Late Woodland people were farmers but maize's importance at this time was marginal. Its successful introduction occurred around 900 CE. Most of the crops grown at the time were from the Eastern Agricultural Complex suite, an older and endemic farming tradition.
The city's complex construction of earthen mounds required digging, excavation and transportation by hand using woven baskets. Construction made use of of earth, and much of the work was accomplished over decades. Its highly planned large, smoothed-flat, ceremonial plazas, sited around the mounds, with homes for thousands connected by laid out pathways and courtyards, suggest the location served as a central religious pilgrimage city.
At the high point of its development, Cahokia was the largest urban center north of the great cities in Mexico and Central America. Home to about 1,000 people before circa 1050, its population grew rapidly after that date. According to a 2007 study in Quaternary Science Reviews, "Between AD 1050 and 1100, Cahokia's population increased from between 1,400 and 2,800 people to between 10,200 and 15,300 people",Benson LV, Berry MS, Jolie EA, Spangler JD, Stahle DW, Hattori EM. "Possible impacts of early-11th-, middle-12th-, and late-13th-century droughts on western Native Americans and the Mississippian Cahokians." Quaternary Science Reviews 2007, 26:336–350, an estimate that applies only to a high-density central occupation area. As a result of archeological excavations in the early 21st century, new residential areas were found to the west of Cahokia; this discovery increased estimates of historic area population.Glenn Hodges, "
target="_blank" rel="nofollow"> America's Forgotten City", National Geographic, January 2011. Archaeologists estimate the city's population at between 6,000 and 40,000 at its peak. If the highest population estimates are correct, Cahokia was larger than any subsequent city in the United States until the 1780s, when Philadelphia population grew beyond 40,000.United States Census Office, A Century of Population Growth from the First Census of the United States to the Twelfth: 1790–1900, Government Printing Office, 1909, p. 11 Its population may have been larger than contemporaneous London and Paris.
Studies of Cahokia's rise see large-scale immigration as an essential contributor to the city's initial rapid growth. At the onset of the "Big Bang," non-local ceramics begins to appear in higher frequencies across site types indicating interaction or immigration from populations around the lower Ohio Drainage (Yankeetown site), Lower Mississippi Valley (Coles Creek), Upper Midwest (below), and south-central plains (Caddo). Many of these immigrants moved into outlying villages in the eastern uplands, referred to as the Richland Complex. Intensive farming and textile production occurred in these villages which has been interpreted as supplicant behavior directed towards the central urban core of the city. The novel practices these immigrant communities brought with them have been argued as essential to the creation of the character of Cahokia as a city. One such example, the common mound-and-plaza pairing, was adopted from longstanding Coles Creek organizational principles.
Contacts across the mid-continent and possibly beyond are attested to have reached a peak between 1050 and 1150 CE. Mill Creek chert from southwestern Illinois, most notably, was used in the production of hoes, a high demand tool for farmers around Cahokia and other Mississippian centers. Cahokia's loose control over distribution, though not production, of these tools was important in emphasizing a new agricultural regime. Mississippian culture pottery and stone tools in the Cahokian style were found at the Silvernale site Cannon Valley Trail near Red Wing, Minnesota, and materials and trade goods from Pennsylvania, the Gulf Coast, and Lake Superior have been excavated at Cahokia. Cahokians traveled down to the Carson Mounds in Coahoma County, Mississippi and built a settlement during the 12th century. Others paddled upriver to the site of Trempleau Bluffs in southern Wisconsin, to create a mounded religious center at the end of the 11th century. It was during the Stirling phase (1100–1200 CE) that Cahokia was at its height of political centralization. Current academic discourse has emphasized religion as a major component in consolidating and maintaining the political power essential to Cahokia's urbanity. The Emerald Acropolis mound site in the uplands, was a site where the moon, water, femininity, and fertility were venerated; the mounds were aligned to lunar events in its 18.6 year cycle. Immigrant ceramics early in the archaeological record argue that it was central in attracting immigrants as pilgrims. Political control was exercised in the Cahokian hinterlands at distinctive temple complexes consisting of T or L shaped structures and Sweat lodge. Distinctive rituals have archaeologically documented at these complexes involving tobacco, red cedar, agricultural produce, and female Cahokian flint clay figurines. Intense public rituals, like the sacrifice of dozens of women at mound 72 and interment of powerful leaders in ridge top mortuary mounds, integrated populations in shared experiences and narratives of their world during the 11th and 12th centuries.
One of the major problems that large centers like Cahokia faced was keeping a steady supply of food, perhaps exacerbated by droughts from CE 1100–1250. A related problem was waste disposal for the dense population, and Cahokia is believed to have become unhealthy from polluted waterways. Because it was such an unhealthy place to live, Snow believes that the town had to rely on social and political attractions to bring in a steady supply of new immigrants; otherwise, the town's death rate would have caused it to be abandoned earlier.
The late 12th century into the turn of the 13th (the Moorehead phase, 1200–1300 CE) was one of change. People stopped constructing and using the earlier T and L shaped ritual buildings as well as large circular rotundas.Baltus, Melissa R. 2014. “Transforming Material Relationships: 13th Century Revitalization of Cahokian Religious-Politics.” University of Illinois at Urbana-Champaign. Family homes were built larger and storage pits previously located outside of them were moved inside. Ceramic styles and production techniques shifted with an increase in plates, cord-marking, and solar-themed iconography. There was also an increase in cemeteries of grouped minor-elites outside of Cahokia. Though mound construction still occurred, it did so at a lesser rate. Many earlier mounds were ritually capped and ceased to be modified afterwards.Skousen, B. Jacob, and Allison L. Huber. 2018. “The Moorehead Phase Occupation at the Emerald Acropolis.” Midcontinental Journal of Archaeology 43 (3): 214–256. Altogether, this has been taken as a time when centralized political structures were weakening and essential religious practices were rethought.
Political, economic, or cultural problems may also have contributed to the community's decline. Thomas Emerson and Kristin Hedman argue that Cahokia's large immigrant population was a factor in the city's ultimate fragmentation, as differing languages, customs, and religions obstructed the creation of a cohesive Cahokian cultural identity. Analyses of Cahokian burial sites and the associated remains have also shown that many Cahokians were not native to the city or its immediate surrounding region. These immigrants were sometimes buried separately from native residents, a possible indicator of weak integration along ethnic lines. It is likely that social and environmental factors combined to produce the conditions that led people to leave Cahokia.
Cahokia's connections to the surrounding regions seems to have shifted from one of direct contact and outpost construction to one of dispersal. The immigrant populations inhabiting upland villages in the so-called Richland Complex were some of the first to leave the city. Many people leaving Cahokia went south into the Cairo Lowlands of southern Illinois and further south in the Central Mississippi Valley. Later, some left for Cumberland River in central Tennessee.Sullivan, Lynne P., Kevin E. Smith, Scott Meeks, and Shawn M. Patch. 2024. “Tracking Mississippian Migrations from the Central Mississippi Valley to the Ridge and Valley with a Unified Absolute Chronology.” American Antiquity 89 (2): 1–17. Finely crafted artifacts from Cahokia, such as copper repoussé plates and engraved shell, appear at powerful centers such as Moundville and Etowah only after 1250 CE.Cobb, Charles R., and Adam King. 2015. “The Rise and Demise of Mississippian Capitals in the Southeast.” In Medieval Mississippians: The Cahokian World. Santa Fe, New Mexico: School for Advanced Research Press. Another possible cause is invasion by outside peoples. Many theories since the late 20th century propose conquest-induced political collapse as the primary reason for Cahokia's abandonment.Emerson 1997, Timothy Pauketat 1994. Evidence of warfare found is defensive wooden stockade and watchtowers that enclosed Cahokia's main ceremonial precinct. Multiple associated 13th century burned villages in the Illinois River to the north speak to the rising tensions at the time.Wilson, Gregory D. 2015. “Incinerated Villages in the North.” In Medieval Mississippians: The Cahokian World, 99–104. Santa Fe, New Mexico: School for Advanced Research Press. Palisades become popular across parts of the Midwest and mid-South during the 13th century as communities begin living together in much more nucleated settlement types. However, Cahokia's palisade may have been more for ritual or formal separation than for military purposes, but bastioned palisades almost always indicate warfare. As Cahokia's population shrank over the 13th century, Cahokia's palisade was rebuilt several times to encompass increasingly-smaller portions of the city.
Diseases transmitted among the large, dense urban population are another possible cause of decline. Similarly, health issues like pellagra are known to arise through maize-intense diets like Cahokia's. However, evidence tying nutritional deficiencies to a broader societal collapse has not been conclusively identified. At Cahokia's beginning around CE 1050, hominy was made though nixtamalization that made the maize more nutritious. Recent research indicates that early Cahokians nixtamalized maize but then stopped nixtamalizing maize around CE 1200. Intense reliance on maize that is not nixtamalized may result in pellagra and death. Isotope analysis of burial remains at Cahokia has revealed iron-deficiency anemia and tooth enamel defects potentially stemming from Cahokia's reliance on maize.
Together with these factors, researchers found evidence in 2015 of major floods at Cahokia, so severe as to flood dwelling places. Analysis of sediment from beneath Horseshoe Lake has revealed that two major floods occurred in the period of settlement at Cahokia, in roughly 1100–1260 and 1340–1460. Durrie Bouscaren, "New insights into the curious disappearance of the Cahokia Mounds builders", St. Louis Public Radio, May 4, 2015, accessed May 6, 2015 "Cahokia's rise and fall linked to river flooding", Popular Archaeology, Spring 2015 While flooding may have occurred early in the rise of the city, it seems not to have deterred the city builders; to the contrary, it appears they took steps such as creating channels, dikes, and that protected at least the central city throughout its inhabited history. In another indication of flood mitigation efforts, Cahokians dispersed their agricultural lands among both lowland and upland fields, thereby reducing the chances that a single cataclysmic flood would wipe out the city's food supply.
Dhegiha Siouan migration was in part responsible for the depopulation of Cahokia. The city is the heritage of many contemporary Native American communities, the former group in particular. Ponca oral tradition specifies their ancestor's time in Cahokia, calling the city or its location "P'ahe zide" red.Headman, Louis V. 2020. Walks on the Ground: A Tribal History of the Ponca Nation. Lincoln: University of Nebraska Press. Following the city's abandonment as such, Algonquian groups from the east moved into the Vacant Quarter in the mid-17th century, specifically those of the Illinois Confederation. The Cahokia people was one such group and from whom the site gets its name.
While Cahokia proper had ceased to exist, the mounds continued to be present on the landscape. Various French settler-colonial families are documented to have claimed the land of the city during the 18th century. St. Louis was defined by the mounds that Cahokians had constructed across the river, referred to at one point as "Mound City." Nearly all these mounds in Downtown St. Louis were destroyed and used for fill in the growing city's construction in the mid-19th century. As Native Americans were forcibly removed from the land through treaties and war (particularly the Black Hawk's War), their claim to the land and its usage was usurped. In downtown Cahokia a group of early 19th century (circa 1809) Trappists lived on the grounds. Later the land was farmed by the Ramey family through the latter-half of the 19th century. This is when serious archaeological interest began as Euro-American settlers began trying to make sense of the site.
Many Indigenous people groups and nations including the Cherokee, Choctaw, Chickasaw, and Muscogee, carry on their moundbuilding traditions similar to those of Cahokia. Native American people continue to venerate the site as sacred, coming to the grounds to perform ceremony and dance. The site has served as inspiration for much Native American art. Notably Howard Revard, an esteemed poet and member of Osage Nation, wrote about the site in Winning the Dust Bowl. Artist Jaune Quick-to-See Smith, a member of Confederated Salish and Kootenai Tribes, displayed the works, " State Names Map: Cahokia" and " Trade Canoe: Cahokia," both inspired by the site, as part of an exhibit at St. Louis Art Museum.
In 1982, UNESCO (the United Nations Educational, Scientific and Cultural Organization) designated the site a World Heritage Site. This is the only such self-contained site in Illinois and among 24 World Heritage Sites in the United States in 2009.
State Senator Evelyn M. Bowles wrote about the Cahokia Mounds site:
The designation has helped protect the property and attract funds to conduct research on this significant civilization.
Residents of outlying areas relied heavily on maize for subsistence, while residents of Cahokia's city center enjoyed more diverse diets. One interpretation is that higher levels of maize consumption may be correlated with a lower social status among Cahokian residents.
The impact that Cahokian agriculture had on the environment, and its relationship to the city's ultimate collapse, is hotly debated. The depletion of farming soil surrounding Cahokia may have led to a decline in food resources that doomed the city. Jane Mt. Pleasant, however, argues that these models of Cahokia's soil longevity are flawed, because it is based on modern understandings of crop yields that assume the use of plows. Cahokians' exclusive use of hand tools was less damaging to the soil and thus may have maintained soil quality far longer than is typical today, making a rapid collapse of agricultural productivity in Cahokia less likely.
Historian Daniel Richter notes that the apex of the city occurred during the Medieval Warming Period. This period appears to have fostered an agricultural revolution in upper North America, as the three-fold crops of maize, beans (legumes), and gourds (Cucurbita) were developed and adapted or bred to the temperate climates of the north from their origins in Mesoamerica. Richter also notes that Cahokia's advanced development coincided with the development in the Southwest of the Chaco Canyon society, which also produced large-scale works in an apparent socially stratified society. The decline of the city coincides with the Little Ice Age, although by then, the three-fold agriculture remained well-established throughout temperate North America.
To the south of Monks Mound is the Grand Plaza, a large area that covered roughly and measured over in length by over in width. Researchers originally thought the flat, open terrain in this area reflected Cahokia's location on the Mississippi's alluvium flood plain, but instead soil studies have shown that the landscape was originally undulating ridge and swale topography. In one of the earliest large-scale construction projects, the site had been expertly and deliberately leveled and filled by the city's inhabitants. It is part of the sophisticated engineering displayed throughout the site. It was used for large ceremonies and gatherings, as well as for ritual games, such as chunkey. The game was played by rolling a disc-shaped chunky stone across the field. The players would throw spears where they thought the chunky stone would land. The game required a great deal of judgment and aim.
The major ceremonial north–south 'axis' connects the main precinct with the large ridgetop mortuary mound to its south now known as the Rattlesnake Mound (Mound 66). The feature, named the Rattlesnake Causeway by archaeologists, was an elevated embankment about wide, roughly in length and varies in height from to almost as it traverses a low swampy area to the south of the Grand Plaza. It is aligned 5° east of north, a direction thought to mimic the Lunar standstill of 5° west of north, albeit in reverse. This is thought to have had symbolic associations to the builders in connection with their lunar maize goddess of the underworld. This is further strengthened by its close proximity to the ridgetop mortuary Mound 72, the underworld connotations of the low water-filled area the causeway traversed, and its terminus at the mortuary complex at the Rattlesnake Mound. The causeway itself may have been seen as a symbolic "Path of Souls".
The high-status central district of Cahokia was surrounded by a palisade that was equipped with protective bastions. A later addition to the site, when the palisade was constructed, it cut through and separated some pre-existing neighborhoods. Archaeologists found evidence of the stockade during excavation of the area and indications that it was rebuilt several times. Its bastions showed that it was mainly built for defensive purposes.
Beyond Monks Mound, as many as 120 more mounds stood at varying distances from the city center. To date, 109 mounds have been located, 68 of which are in the park area. The mounds are divided into three different types: platform mound, conical, and ridge-top. Each appeared to have had its own meaning and function. In general terms, the city center seems to have been laid out in a diamond-shaped pattern about from end to end, while the entire city is across from east to west.
Cahokian domestic structures were generally of pole-and-thatch construction and followed rectangular footprints. Wall trenches were often used instead of posts for building construction.
Alleen Betzenhauser and Timothy Pauketat argue that upwards of 20 percent of Cahokia's neighborhood structures did not serve domestic functions, but were rather intended to facilitate engagement with non-human spiritual beings as part of an animistic religion. These beings may have resided in the building itself or inhabited large marker posts, similar to the posts used to build the Cahokia Woodhenge. Betzenhauser and Pauketat compare their theorized Cahokian buildings to similar historical examples such as shaking tents or medicine lodges.
Monks Mounds was named for the community of Trappists monks who resided there for a short time, after settled in the area. Excavation on the top of Monks Mound has revealed evidence of a large building, likely a temple or the residence of the paramount chief, which would have been seen throughout the city. This building was about long and wide, and could have been as much as high. It was about .
The east and northwest sides of Monks Mound were twice excavated in August 2007 during an attempt to avoid erosion due to slumping. These areas were repaired to preserve the mound.
The falcon warrior or "birdman" is a common motif in Mississippian culture. This burial clearly had powerful iconography significance. In addition, a cache of sophisticated, finely worked in a variety of different styles and materials was found near the grave of this important man. Separated into four types, each from a different geographical region, the arrowheads demonstrated Cahokia's extensive trade links in North America.
Archeologists recovered more than 250 other skeletons from Mound 72. Scholars believe almost 62% of these were sacrificial victims, based on signs of ritual execution, method of burial, and other factors.Young & Fowler, p. 148. The skeletons include:
The relationship of these burials to the central burial is unclear. They were unlikely to have all deposited at the same time. Wood in several parts of the mound has been radiocarbon-dated to between 950 and 1000 CE.
Excavations have indicated that Mound 72 was not constructed as a single mound, but rather as a series of smaller mounds. These mounds were reshaped and covered over to give Mound 72 its final ridge-top shape.
Artisans produced religious items, such as long-nosed god maskettes, ceremonial earrings with a symbolic shape, thought to have been used in fictive kinship rituals. Many of the stylistically related Mississippian copper plates, such as the Wulfing cache from southeastern Missouri, some of the Etowah plates from Georgia, and many of the Spiro plates from Oklahoma, are associated with the Greater Braden style and are thought to have been made in Cahokia in the 13th century.Kelly et al. in King, 57–87Townsend, Sharp, and Bailey 151Bolfing 67–68
The post holes found by Wittry are an example of how soil retains the memory of organic materials that decayed in the soil from thousands of years ago. Many soils have a naturally acidic component that breaks down most organic material pretty quickly, but leaves behind dark discoloration in the soil. The original posts of Cahokia Woodhenge left behind this same discoloration, allowing researchers to easily identify the soil as having once contained wooden posts.
Additional excavations in the 1960s–1980s used predictions based on verified posthole locations and spacing to locate other postholes and confirm the existence of five separate timber circles in the general vicinity. The circles are now designated Woodhenges I through V in Roman numerals. In 1985, a reconstruction of Woodhenge III was built with the posts being placed into the original excavated post positions. The circle, which has 48 posts in the circle and a 49th central post, has been used to investigate archaeoastronomy at Cahokia. The Illinois Historic Preservation Division that oversees the Cahokia site hosts public sunrise observations at the vernal and autumnal and the winter and summer . Out of respect for Native American beliefs, these events do not feature ceremonies or rituals of any kind.
One survivor of these mounds is Sugarloaf Mound. Located on the west bank of the Mississippi, it marked the initial border between St. Louis and the once autonomous city of Carondelet. The basal remnant of another likely related mound is located in O'Fallon Park in St. Louis.
One of the largest Mississippian sites is Kincaid Mounds State Historic Site, located in Massac and Polk counties in southern Illinois. It is southeast of Cahokia, located in the floodplain of the Ohio River. With a total of 19 mounds at the complex, it is considered the fifth-largest Mississippian site in terms of the number of monuments. It is believed to have been a chiefdom, as an elite burial mound was among those found. The site is designated as a National Historic Landmark.
Domestic architecture
Monks Mound
Mound 72
Copper workshop
Cahokia Woodhenge
Greater Cahokia
Related mounds
See also
Notes
Bibliography
Further reading
External links
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