The Anasazi didn't just vanish. Skeletal remains hint that disease and food shortages played a role in their demise.

The Anasazi didn't just vanish. Skeletal remains hint that disease and food shortages played a role in their demise.


September 2, 2025 | Alex Summers

The Anasazi didn't just vanish. Skeletal remains hint that disease and food shortages played a role in their demise.


Meet The Anasazi

The Anasazi, also the Ancestral Puebloans, were the ancestors of today’s Pueblo peoples of the American Southwest. The term “Anasazi” comes from a Navajo word meaning “ancient enemies” or “ancient outsiders”. They were doing so well, then….they supposedly vanished.

Anasazi

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Who Are The Anasazi

The Anasazi resided in the Four Corners region, where the states of Utah, Colorado, Arizona, and New Mexico meet. Their culture flourished from around 200 BCE to 1300 CE, with significant developments during the Basketmaker and Pueblo periods. Today, they are survived by modern Pueblo peoples, including the Hopi and Zuni.

File:Pueblo Indian - Decal Postcard (8686076982).jpgSteve Shook, Wikimedia Commons

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Their Early Life Was Quite Simple

Early Ancestral Puebloans were hunters and gatherers. They lived in pithouses and moved seasonally. Daily life centered on survival and adapting to the arid land—long before pottery or complex rituals emerged. Here is how all that unfolded.

 Ancestral PuebloansThomas C. Gray, Wikimedia Commons

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Their Move From Nomads To Farmers

Around 100 BCE, communities transitioned from a nomadic lifestyle to one of planting crops. The families would tend cornfields while weaving tightly woven baskets for storage. These farmers began settling in small clusters, laying the foundations of the Ancestral Puebloan civilization that would shape the region for centuries.

File:Woven bag, 1100-1400 AD, Kayenta Anasazi, Priestess House, Arizona, yucca cordage - Natural History Museum of Utah - DSC07364.JPGDaderot, Wikimedia Commons

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Their Crops Were Corn, Beans, And Squash

Called the “Three Sisters,” maize, beans, and squash were essential for survival. Corn-dominated diets provided the majority of the calories they needed. Beans added protein, squash offered vitamins, and together the waste enriched the soil as manure.

File:Corn cob, 900-1275 AD, San Juan Anasazi, Sheep Horn Alcove, Utah - Natural History Museum of Utah - DSC07353.JPGDaderot, Wikimedia Commons

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They Began Building Above Ground

Early families dug shallow pits, covering them with timber and adobe. Entry came through the roof ladders to create a cool shelter in summer and warmth in winter. Later, archaeologists discovered household items left behind, and they included bone awls and stone scrapers, all preserved in the earth for centuries.

File:Pueblo Pintado ancestral puebloan great house..jpgJames Q. Jacobs, Wikimedia Commons

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Their Clay Vessels Changed Daily Life

Over time, pottery began to replace baskets as cooking and storage vessels. Coiled clay pots with black-on-white designs were both functional and artistic. With pottery also came new foods: stews, boiled corn, boiled beans, and preserved seeds. The result? A more diversified diet that strengthens long-term food security.

File:Storage Jar with Horizontal Bands of Interlocking Scrolls, Ancestral Pueblo (Anasazi), Black Mesa Black-on-white Kayenta Area, Northeastern Arizona, AD 875 1130, Art Institute of Chicago, Chicago, Illinois (28549010997).jpgKen Lund from Reno, Nevada, USA, Wikimedia Commons

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Farming In The Harsh Desert Southwest Wasn’t Easy

To grow corn in the desert, one needed mastery of water. The Anasazi had to think quickly, and they devised carved check dams to manage the water. Additionally, they built canals and created reservoirs to catch seasonal rain. These networks supported entire villages, and they transformed arid land into green patches.

Mt. Kinesava From Anasazi Way, Rockville, UtAaron Zhu, Wikimedia Commons

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Basketmakers Also Made Rock Art

On canyon walls, hunters would carve graffiti—art and messages—in the form of spirals, animals, and figures. Some aligned with solar events, such as equinoxes. These may have been used to guide generations on planting cycles or tell of generational stories.

File:Anasazi Indian petroglyph (~600 to 1300 A.D.) (Mesa Verde National Park, Colorado, USA) 5 (22818593335).jpgJames St. John, Wikimedia Commons

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In The Transition To Pueblo I, The Villages Grow Larger And More Complex

By 750 CE, small clusters merged into larger pueblos. Communities built larger rectangular rooms above ground from stone and adobe. Dozens of families shared walls and worked side by side. These developments created stronger ties and marked the rise of towns.

File:Scenic Byway 12 - A Reconstructed Anasazi House - NARA - 7721683.jpgS. Clyde, Wikimedia Commons

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The Rise Of Multi-Room Houses

The growing population needed new houses. And so, the people took an architectural leap by building multi-room compounds. Using sandstone blocks cemented with mud, people built structures two stories high. These complexes were so sophisticated that others had plazas and courtyards, where children played and elders taught traditions.

File:San Juan Skyway - Anasazi Heritage Center - NARA - 7721461.jpgUnknown author, Wikimedia Commons

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They Also Built Kivas, Sacred Spaces Underground

Kivas—circular, underground ceremonial chambers—emerged as cultural centers. Entered through ladders, they featured fire pits and sipapus, symbolic portals to the spirit world. Everything administrative and religious unfolded here. To date, the kiva remains one of the most recognizable and enduring Puebloan legacies.

File:Mule Canyon Village - Kiva (53879089770).jpgBLMUtah, Wikimedia Commons

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Trade Was Booming

The Anasazi traded across vast networks—from Mesoamerica to the Pacific. They acquired macaws, seashells, turquoise, and copper via intermediaries and regional allies like the Hohokam. Chaco Canyon facilitated this exchange, transforming exotic goods into cultural capital and connecting desert communities to distant civilizations through commerce.

File:Gfp-anasazi-pottery.jpgYinan Chen, Wikimedia Commons

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Pueblo II: The Dawn Of Monumental Construction

Around 900 CE, something shifted. Stone masonry improved, and the multi-storied dwellings we just spoke about spread further across the land. This was no longer a scattering of villages—it was the era of monumental public works that hinted at an expanding social and spiritual order.

File:Cliff dwellings in Mesa Verde NP 09.jpgJbjensen1, Wikimedia Commons

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More Context On What Pueblo Means

Before we proceed, here is context on the term “Pueblo”. The names Pueblo I and Pueblo II originate from the Pecos Classification System, a chronological framework that archaeologists use to organize the cultural evolution of the Ancestral Puebloans. These labels mark distinct periods of everything from technological to social development.

File:Anasazi pueblo overton.jpgTadam, Wikimedia Commons

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Chaco Canyon Emerges As A Cultural Powerhouse

Among the Pueblo II structures was the Chaco Canyon, which became the beating heart of the Anasazi world. Great houses like Pueblo Bonito held hundreds of rooms. Roads radiated outward in straight lines across the desert. Think of it as a hub of ceremony and astronomy. Even centralized power.

File:Chaco Canyon - Taaqa 'man' at Pueblo Bonita.jpgKyleson1, Wikimedia Commons

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Pueblo Bonito Was A Stone City Of 600 Rooms

Pueblo Bonito wasn’t just large—it was extraordinary. Four stories high, shaped like a giant “D,” it contained plazas, kivas, courtyards, and storerooms. With 600 rooms, it stood as the largest building in North America until the 19th century. What came next raised more eyebrows.

File:PUEBLO BONITO - Chaco Culture National Historical Park, New Mexico, US - panoramio (6).jpgMARELBU, Wikimedia Commons

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Highways Linking The Ancient Southwest

Straight as arrows, massive roads up to 30 feet wide cut through mesas— elevated flat-topped landforms that served as prime real estate for early settlements and deserts. Some stretched 60 miles without deviation. These trails were engineered thoroughfares connecting distant settlements. But why build such effort-demanding paths?

File:New Mexico March 1996 - Puebloan Structures 03.jpgInfrogmation of New Orleans, Wikimedia Commons

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Ancient Astronomical Precision

High on Fajada Butte, slabs of stone cast dagger-shaped rays of light onto carved spirals. On solstices and equinoxes, they aligned perfectly. This solar calendar guided planting and ceremonies. Astronomy was engineered into architecture for these people, setting the stage for their marvels.

File:Hopi petroglyph - Mesa Verde National Park.jpegNational Park Service, Wikimedia Commons

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Mesa Verde’s First Cliff Settlements Appear

By 1100 CE, families turned canyon cliffs into homes. They carved dwellings into alcoves, stacked rooms vertically, and used ladders to reach them. These stone villages seemed like fortresses against time, though their real purpose became clearer as threats emerged later. FYI, Mesa Verde means “green table” in Spanish.

File:Cliff dwellings in Mesa Verde NP 12.jpgJbjensen1, Wikimedia Commons

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Terraces And Reservoirs Got More Advanced

Agriculture also kept advancing. The terraces they built slowed erosion. Then, the reservoirs captured run-off, and check dams maximized water. This adaptation allowed larger populations to thrive. However, survival in such a harsh land always came at a cost, and soon environmental stress began to knock at the door.

File:New Mexico March 1996 - Puebloan Structures 01.jpgInfrogmation of New Orleans, Wikimedia Commons

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Enter Pueblo III: The Era Of Cliff Palaces

With the sky as the limit, the villages kept climbing even higher into cliffs. Entire palaces with hundreds of rooms, like Cliff Palace at Mesa Verde, towered above canyons. These complexes dazzled in size and sophistication. Yet, the shift to such hard-to-reach sites hinted at something unsettling.

File:MesaVerdeNationalParkCliffPalace.jpgMassimo Catarinella, Wikimedia Commons

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Tower Kivas And Defensive Fortresses Multiply

Circular kivas rose into towers, and fortresses appeared on canyon rims. Construction choices reveal communities bracing for conflict. Burned timbers and defensive walls suggest more than architectural ambition. This was a society preparing for turbulent times—the storm was coming.

File:Tower kiva at Chetro Ketl.JPGRationalobserver, Wikimedia Commons

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The Signs Of Social Strain Showed

Archaeologists often find sites that were suddenly deserted, only to be reoccupied nearby. Moving so frequently signaled stress. Food shortages or even social fractures may have triggered these shifts. Such patterns suggest that life was becoming increasingly unstable.

File:Sara Fina Tafoya firing blackware pottery at Santa Clara Pueblo, c. 1900.jpgUnknown authorUnknown author, Wikimedia Commons

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The Great Drought Of 1276–1299 Begins

Then came the turning point. Tree rings show a drought lasting over two decades, one of the worst in recorded prehistory. Crops withered, water vanished, and survival became a desperate struggle. Every community felt the weight of the relentless sun pressing down year after year.

File:Aztec Ruins October 2022 panorama.jpgKing of Hearts, Wikimedia Commons

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Scientific Proof Of Drought

Dendrochronology—the science of dating tree rings—reveals the exact years of drought. Rings narrowed dramatically during the late 1200s, confirming a catastrophic environmental event. Farmers couldn’t ignore such prolonged aridity. These rings provide hard proof that the Great Drought was no myth—it carved itself into wood.

Dendrochronology At ChacoEnglish: NPS Photo , Wikimedia Commons

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Deforestation And Soil Depletion Spread

With a growing population, timber use increased significantly for building and firewood. As a result, forests near Chaco Canyon vanished, and this forced people to haul logs over 60 miles. The soil wore thin from overfarming, making it harder to grow crops. Environmental pressure piled on, something communities could not sustain.

File:Chaco Culture National Historical Park-92.jpgAlisonRuthHughes, Wikimedia Commons

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Violence Was Also On The Rise

Excavations done much later expose skeletons with skull fractures. Others even had scalping marks. And they also discovered burned dwellings. These point to episodes of violence. Conflict may have erupted as resources began to dwindle. Tensions boiled over, and neighbors who once traded may have turned on each other.

File:Plundered Native American grave site with broken pottery.pngU.S. Department of the Interior, Bureau of Land Management, Wikimedia Commons

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Others Took Safety In Sheer Rock Walls

Why climb into cliffs for shelter? Safety. Remote alcoves provided defense against raids. Ladders could be pulled up, and narrow entries could be controlled. These fortresses were survival hideaways. Such drastic measures hint that insecurity dominated everyday life during the late 1200s.

File:Blanding Little Westwater.jpgHJPD, Wikimedia Commons

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There Were Evidence Of Raids

Some sites reveal massacres—entire families left where they fell. Raids likely came from migrating groups or rival factions competing for dwindling farmland. Fortifications and burned structures serve as chilling reminders of a time when trust eroded and survival meant constant vigilance.

File:05161 Grand Canyon Historic- Anasazi Ruins 1968 (4738921167).jpgGrand Canyon National Park, Wikimedia Commons

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Malnutrition And Disease Leave Their Mark On Skeletons

The bones from this time really tell the story—people stopped growing the way they should, because their skeletons showed holes and signs of anemia. Food was running out, villages were packed and stressed, and once disease hit, weakened bodies just couldn’t fight back.

File:Aztec Ruins October 2022 011.jpgKing of Hearts, Wikimedia Commons

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Infant Mortality Surges In The Late 13th Century

Burials say it all. More and more infants and young kids in the late 13th Century didn’t make it. Malnutrition and mothers weakened by drought all added to the toll. And every tiny grave wasn’t just a family’s loss; it was a community slowly coming apart.

File:Nude pueblo Indian girl holding small child.jpgMonsen, Frederick, 1865-1929, photographer., Wikimedia Commons

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Religious Shifts

Some great ceremonial towers were abandoned mid-construction. Their sudden halt points to shifting beliefs. Communities may have lost faith in old centers like Chaco, turning toward smaller, more local traditions. These changes mark the first visible steps toward a new cultural direction.

File:Ceremonial Kiva Remains at Pecos Pueblo (known historically as Cicuye).jpgNetherzone, Wikimedia Commons

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Chaco Canyon’s Influence Fades Into Silence

Once the heart of a vast network, Chaco Canyon fell quiet. Great houses emptied, roads no longer pulsed with travelers. Yet silence here was different because it signaled movement. People carried their traditions to new lands, where they reshaped them.

File:Ruins at Chaco Canyon - 2000-6.jpgpedrik, Wikimedia Commons

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Settlements Emptied By 1300 CE

By the end of the 13th century, all the cliff palaces and sprawling pueblos stood deserted. But just don’t lose hope because the story didn’t end in ruin. Communities relocated, and they carried with them corn seeds, pottery styles, and spiritual practices to distant valleys. Migration was survival, not collapse.

File:Pecos National Historic Site - Ruins of Pecos Pueblo.jpgNetherzone, Wikimedia Commons

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They Sadly Could Not Carry Everything With Them

Later on, archaeologists uncovered pieces of grinding stones and entire homes that were abandoned as if the people had walked away in haste. However, the descendants tell a different story: items were left intentionally as a symbolic nod to closure. Leaving old places behind like sealed chapters.

File:Mortar and pestle, AD 900-1300.jpgNetherzone, Wikimedia Commons

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Hopi And Zuni Oral Traditions Recall The Journey

Oral histories preserved by Hopi and Zuni recount migrations from the north. These stories recall and retell the whole journey—one guided by spiritual duty and cycles of renewal. Their stories encode geography, seasonal rhythms, and sacred obligations, often aligning with archaeological evidence, such as settlement patterns and ceremonial architecture.

File:Zuni Indian women carrying water pots on heads LCCN2016649405.jpgMiscellaneous Items in High Demand, PPOC, Library of Congress, Wikimedia Commons

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Migration To The Rio Grande

Evidence shows groups resettling along the Rio Grande. New pueblos rose with familiar designs like the kivas and communal storage. These settlements grew into thriving centers to prove that cultural continuity outweighed the loss of older homelands in the Four Corners.

File:Rio Grande White Rock Overlook Park View 2006 09 05.jpgAndreas F. Borchert, Wikimedia Commons

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Pueblo People Today Claim Direct Ancestry To The Anasazi

Modern Pueblo nations, including Hopi, Zuni, and Tewa, proudly trace their heritage to these ancestral builders. Ceremonies, farming techniques, and architectural traditions remain alive and well. Continuity here is a direct link from past to present, unbroken by centuries.

File:Ohkay Owingeh0.jpgEinar E. Kvaran aka Carptrash (talk), Wikimedia Commons

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Archaeologists Reject The Word “Anasazi” As An Outsider’s Label

The term “Anasazi,” meaning “ancient enemies” in Navajo, misrepresents the identity of the ancient people. Today, “Ancestral Puebloans” better honors continuity with living Pueblo peoples. Language matters, and this shift acknowledges that these communities have adapted and continue to live on in today’s pueblos.

File:Maria Martinez making pottery at her house in 1905.jpgUnknown photographer, Wikimedia Commons

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Fringe Theories: Aliens, Portals, And Lost Civilizations

Beyond science, wild ideas emerged to explain their “vanishing”—aliens abducted them, or portals spirited them away. These theories, found in pop culture, lack evidence but capture the public’s imagination. Enduring mysteries sometimes inspire speculation far removed from archaeology’s grounded discoveries.

File:Puerco Pueblo petroglyphs, Petrified Forest National Park.jpgMPSharwood, Wikimedia Commons

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Climate And Conflict Over Myth And Mystery

Archaeological science consistently indicates that drought, depleted resources, malnutrition, and conflict are key forces of change. Real people faced tangible struggles. Understanding these grounded causes gives richer respect for their resilience and places their story firmly in the history of human adaptation.

File:05165 Grand Canyon Historic- Anasazi Ruins 1968 (4738921415).jpgGrand Canyon National Park, Wikimedia Commons

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Mesa Verde Was Declared A National Park In 1906

Mesa Verde’s cliff dwellings gained protection in the early 20th century. Visitors today climb ladders into Cliff Palace or Balcony House, walking the same routes Ancestral Puebloans once used. These preserved spaces stand as monuments to ancient skill and enduring legacy.

File:Canyon, Mesa Verde National Park, Mancos, CO.jpgw_lemay, Wikimedia Commons

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Chaco Canyon Becomes A World Heritage Site

Chaco’s vast ruins, astronomical alignments, and massive great houses earned UNESCO World Heritage status in 1987. Recognition of its global significance ensures that this cultural heartland remains a place of study and respect for generations to come.

File:Chaco Canyon-Pueblo del Arroyo-04-1982-gje.jpgGerd Eichmann, Wikimedia Commons

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Ancient Sites Continue To Guide Astronomical Research

Even now, researchers continue to examine how sunlight and moonlight interact with the petroglyphs and the kivas they constructed. Ancient builders left astronomical records carved in stone at these sites, which continue to inform modern science.

File:Kiva Chaco Canyon NM.jpgUrban~commonswiki, Wikimedia Commons

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The Mystery Endures

Despite decades of study, questions remain. Migration, drought, and conflict explain much, but gaps persist in the record. This uncertainty is part of the allure. The Ancestral Puebloans left behind not only ruins but an enduring mystery that continues to captivate.

File:Chaco Culture National Historical Park CHCU7059.jpgNational Park Service Digital Image Archives, Wikimedia Commons

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