A Native American-led nonprofit has announced that it purchased nearly 40 acres (16.2 hectares) of land in the Black Hills of South Dakota amid a growing movement that seeks to return land to Indigenous people.

The Cheyenne River Youth Project announced in an April 11 statement that it purchased the tract of land adjacent to Bear Butte State Park in western South Dakota.

“One of the most sacred places for the Lakota Nation is Mato Paha, now part of Bear Butte State Park,” the statement said. “Access to Bear Butte was severed in the late 19th century, when the U.S. government seized the Black Hills and broke up the Great Sioux Reservation into several smaller reservations.”

Julie Garreau, executive director of the project, said in the statement that the U.S. Supreme Court ruled in 1980 that the U.S. had illegally taken the Black Hills. The court awarded the Lakota people $105 million, but they have refused to accept the money because the Black Hills were never for sale, the statement said.