In 1980, the U.S. Supreme Court held that the Sioux Nation had been unfairly deprived of their land in the Black Hills, an action that required just compensation. This land encloses the entirety of Rapid City, which sits on the eastern slope of the Black Hills.
However, the court offered monetary compensation for the land rather than the restoration of the land. This was something the Sioux would not accept. The award of $102 million remains unclaimed. Instead, it has been accumulating interest in a treasury account for decades, and now amounts to over $1 billion.