The Vanishing of 60 Million

An estimated 50–60 million American bison range across the Great Plains and beyond — one of the largest concentrations of large mammal biomass in world history. Indigenous peoples have sustainably hunted bison for over 10,000 years.

European settlers push bison out of Ohio entirely. Plowing, farming, and habitat destruction begin eroding bison range along the eastern frontier. This marks the first clear wave of localized extirpation.

The Lewis and Clark expedition travels the upper Missouri River, reporting enormous herds that "darkened the plains." Their journals help establish the baseline abundance of pre-collapse bison populations and document the animal's central role in Plains ecosystems.

The commercial market for bison robes and tongues grows rapidly. Native American tribes increasingly trade hides for Euro-American goods, intensifying hunting pressure beyond subsistence needs. Early signs of market-driven overexploitation emerge on the Great Plains.

President Andrew Jackson signs the Indian Removal Act, forcing tens of thousands of Native Americans from their eastern homelands to west of the Mississippi. This policy dramatically reshapes the human geography of the Plains and accelerates Euro-American expansion toward bison territory.

Bovine diseases carried by domestic cattle begin infecting bison herds. Feral horses, themselves introduced by Europeans, compete for grassland resources. These ecological pressures — combined with drought cycles — compound the impact of hunting before the main commercial slaughter begins.

Railroad construction across the Great Plains physically divides bison into separate northern and southern herds. Hundreds of thousands of bison are killed to feed railroad crews and army posts. Buffalo Bill Cody gains fame as a commercial hide hunter. The railroad also moves professional hunters and their rifles onto the Plains at industrial scale.

U.S. troops massacre a peaceful encampment of Cheyenne and Arapaho people in Colorado. Sand Creek marks a brutal intensification of U.S. military campaigns on the Plains, directly tied to the strategy of destroying Native peoples' subsistence base — including bison.

Medicine Lodge Treaty attempts to confine southern Plains tribes to reservations, reducing bison territory available to Indigenous hunters. The ongoing Plains Indian Wars accelerate U.S. military pressure. Generals Sherman and Sheridan explicitly support the extermination of bison as a war strategy against Native peoples.

A Pennsylvania tannery discovers how to commercially tan bison hides for industrial leather, making year-round hunting profitable. European demand — particularly from Germany — explodes. This single technological shift triggers the most destructive phase of commercial hunting. In 1871–72, an average of 5,000 bison were killed every single day.

Territorial delegate R.C. McCormick introduces a federal bill making it illegal to kill bison on public lands except for food. The bill mysteriously disappears before it can be voted on. Several states pass nominal protections, but none are enforced — in many cases, by design. The military actively provides ammunition to commercial hunters.

The U.S. Secretary of the Interior formally states that "the civilization of the Indian is impossible while the buffalo remain on the Plains." The Army begins providing free ammunition to hide hunters. This marks the explicit militarization of ecological destruction — the killing of bison as a weapon of Indigenous subjugation.

Commercial hunters wipe out the southern bison herd in the Texas Panhandle and southern Plains in just two years. The Red River War (1874–75) forces the last free southern Plains tribes — Comanche, Kiowa, Cheyenne — onto reservations as their primary food source collapses. The southern herd is functionally gone by 1878.

Lakota and Cheyenne forces defeat Custer at Little Bighorn. The U.S. response is a massive military escalation on the northern Plains. As the northern bison herd becomes the last refuge for still-free nations like the Lakota Sioux, its destruction becomes an explicit military objective.

The northern herd — the last major population — collapses with terrifying speed. In the winter of 1881–82, one county in Montana shipped 180,000 bison skins. By 1883, Sitting Bull's Lakota hunting party searches desperately but finds almost no bison at all — a journey that ends in mass starvation and, ultimately, surrender.

Sitting Bull leads what becomes the last major Lakota bison hunt. They find almost nothing. The disappearance of the bison directly forces the surrender of the last free Plains nations. For the Lakota, Comanche, Blackfoot, and dozens of other peoples, the bison's extinction meant the end of their economic sovereignty and a way of life 10,000 years old.

Zoologist William Hornaday conducts the first systematic count of bison across North America and finds only 541 animals remaining — down from 60 million in less than a century. A wild Yellowstone herd of 25 animals and a handful of private captive herds represent the entire genetic future of the species.

With the bison gone and reservation life enforced, the Ghost Dance movement — a spiritual response to cultural genocide — is suppressed violently at Wounded Knee. The U.S. Army kills between 250 and 300 Lakota Sioux. The collapse of the bison and the Wounded Knee massacre are directly linked — both mark the enforced end of the Plains Indian way of life.

The Lacey Act creates federal penalties for poaching in Yellowstone, protecting the last wild herd of approximately 25 bison. This tiny herd, along with 5–6 small captive herds maintained by private ranchers and a few Indigenous families, constitutes the entire founding population for all subsequent recovery.

William Hornaday and President Theodore Roosevelt co-found the American Bison Society at the Bronx Zoo, the first organized effort to scientifically manage bison recovery. The Society begins moving captive animals to new federal ranges and works to establish protected reserves — pioneering modern wildlife conservation methods.

Fifteen bison from the Bronx Zoo are shipped by train to the newly established Wichita Mountains Wildlife Refuge in Oklahoma — the first intentional reintroduction to public land. The bison arrive in wooden crates on a freight car. This moment is considered the symbolic start of managed bison recovery.

Bison numbers on federal reserves and private ranches slowly climb. By 1944–47, an estimated 5,000 animals exist in North America. However, the vast majority are on private ranches managed for commercial production, raising genetic integrity concerns as bison-cattle hybridization becomes widespread.

The American Indian Movement (AIM) and the broader Indigenous rights movement revive attention to treaty violations and cultural erasure. The near-extinction of bison — and its deliberate political nature — becomes a symbol of broader injustice. Indigenous-led bison restoration efforts begin as acts of cultural reclamation.

Indigenous nations form the InterTribal Buffalo Council to reestablish bison herds on tribal lands — reclaiming both the animal and cultural sovereignty. Today the Council includes over 80 tribal nations managing more than 20,000 bison. Tribal restoration is now a central pillar of bison recovery, explicitly linking ecological restoration with Indigenous self-determination.

President Obama signs the National Bison Legacy Act, making the American bison the official national mammal of the United States. The designation acknowledges the animal's ecological and cultural significance. By this point, approximately 400,000 bison exist in North America — the vast majority on private ranches, with only about 30,000 in conservation herds.

Roughly 363,000–400,000 bison exist in North America today, but only ~15,000–30,000 are in conservation herds on public or tribal land. The species is genetically recovered but ecologically marginalized — a pale ghost of the continent-shaping force it once was. Research confirms that bison-reliant Indigenous communities suffered a permanent, lasting economic shock that still reverberates today.