United States v. White Mountain Apache Tribe, 537 U.S. 465 (2003), was a case in which the Supreme Court of the United States held in a 5–4 decision that when the federal government used land or property held in trust for an Indian tribe, it had the duty to maintain that land or property and was liable for any damages for a breach of that duty. In the 1870s, the White Mountain Apache Tribe was placed on a reservation in Arizona. The case involved Fort Apache, a collection of buildings on the reservation which were transferred to the tribe by the United States Congress in 1960.