Sioux ownership of the Black Hills was established by the Fort Laramie treaty of 1868 between several Indigenous nations and the US government. This treaty created the 60-million-acre (24.3 million hectares) [1] Great Sioux Reservation that included the Black Hills and upon which trespass of white settlers was expressly forbidden [1][2][9].

Black hills gold rush

Six years after the Fort Laramie treaty was signed, white settlers discovered gold in the Black Hills, and thousands of prospectors invaded the reservation [2][4]. This resulted in several conflicts, culminating in the Battle of Little Bighorn (1876) when George Armstrong Custer’s 7th cavalry was defeated by the Sioux [9][4]. In retaliation for this defeat, President Ulysses Grant reneged on the treaty of Fort Laramie, doubled military presence in the Black Hills, and relocated the Sioux to smaller reservations in 1877 [9][10][2][4].

Indigenous subsistence became increasingly difficult through the late 19th century as settlers hunted buffalo to near extinction. The Dawes Allotment Act (1887) redistributed commonly held tribal land to individuals and families, further eroding communal land ownership. Much of the land re-alloted by the Dawes act eventually fell into the hands of settlers [1][9].

Gold mining in the Black Hills produced an incredible amount of gold for over a century. The Homestake mine was one of the largest known gold deposits in the world and produced 40% of the gold mined in the US—a total of 1,100 metric tons between 1876-1991. Homestake operated until 2001, became over 8,000 feet deep, and discharged millions of tons of mine tailings into local creeks [15]. Whitewood creek became a superfund site in 1983. Although the mining company did some cleanup in the 1990s, a 2018 study found high levels of arsenic and mercury in the Belle Fourche, Cheyenne and Missouri rivers [15]. Silver was also mined in the region [13][14].

Wounded Knee

Ongoing Sioux resistance to westward settler expansion revived in about 1890 when the ghost dance emerged as a spiritual/religious resistance movement. This alarmed settlers, and fearing that Sitting Bull (a leader at the Battle of Little Bighorn) would support the ghost dance movement, federal Indian agents killed him in a botched arrest attempt. Two weeks later, on December 29, 1890, the US army attempted to disarm Lakota people at the Pine Ridge Reservation and ended up slaughtering over 250 people [11].

The Wounded Knee massacre became a highly symbolic event in American history, and eighty-three years later (1973), the massacre site was occupied by secessionist leaders of the American Indian Movement (AIM) who were protesting against reservation leadership and demanding re-negotiation of rights granted by the Fort Laramie treaties. The occupation resulted in a 2-month standoff between AIM supporters and US Marshalls supported by the FBI. A few people were killed, and a privately owned home and museum on the massacre site were destroyed [11]. In 2013, the landowners attempted to sell 40 acres (16.9 hectares) including the massacre site to the Sioux for nearly $5 million dollars (the land assessed at $14,000). The Oglala Sioux tribe seized the land under eminent domain [11]. The Oglala and Cheyenne River Sioux agreed to purchase the land in 2022 [12].

Tunkasila Sakpe (Mt Rushmore)

Between 1927 and 1939, white settlers carved the faces of four US presidents (Washington, Lincoln, Jefferson, and Roosevelt) into the face of a mountain called Tunkasila Sakpe [4][9] which is a Sioux sacred site. This sculpture—which the US government calls Mount Rushmore—is an important tourist attraction that is presented as a shrine to democracy, but many people see it as a symbol of white supremacy [2][5][7]. The sculptor Gutzon Borglum who was contracted for the carvings also carved a prominent confederate memorial at Stone Mountain, GA and was a member of the Ku Klux Klan [2][5].

In 1971, AIM staged an occupation of Tunkasila Sakpe, scaling the mountain and refusing to come down until their 1868 treaty rights were honored. About a dozen people were arrested.

Donald Trump held a campaign rally at so-called Mt Rushmore in 2020; hundreds of people protested the event and barricaded roads, leading to several arrests [2][5][6][7]. Attention garnered by this act of resistance amplified the Land Back movement that was launched in part by the NDN Collective, and which is becoming a meta-narrative that brings together various organizations and elements of the Indigenous environmental movement [8]. Land Back is a widespread meme appearing at environmental justice conflicts throughout North America. The central demand of Land Back is return of public lands to Indigenous people. Federal land accounts for about 28% of land in the US.

 Legal battle (US vs Sioux Nation)

In 1920, the Sioux petitioned to argue for their land claim in US courts [4]. The lawsuit persisted for sixty years, but in 1980 the US Supreme Court ruled in United States vs. Sioux Nation of Indians that Sioux land was illegally stolen and awarded them $102 million. The court opinion stated that “A more ripe and rank case of dishonorable dealings will never, in all probability, be found in our history” [2]. The Sioux refused the money (a pittance considering the amount of gold taken from the region), maintaining that their sacred land was not for sale, and demanded their land back [2][4]. The money was placed in an interest-bearing trust and amounted to about $2 billion in 2021 [2].

Pipelines

Pipelines transporting crude oil from the Canadian tar sands to refineries on the gulf coast were a source of conflict in He Sapa from about 2008 to 2017. Sioux people opposing these pipelines on the grounds of treaty rights have been an important focal point in fights against the Keystone XL and Dakota Access pipelines [9][10]. The pipelines present a threat to lakes and rivers that would be endangered by an oil spill.

Homestake mine produced of 1,100 metric tons of gold between 1876-1991. The mine closed in 2001. Placer mining of alluvial deposits and smaller hard-rock mines produced some additional gold and silver.

Mount Rushmore is visited by over two million people per year.

The Dakota Access pipeline has a capacity of 750,000 barrels of crude/day.