In which Supreme Court decision did the Court uphold a federal regulation regarding federally-protected horses and burros on grazing lands?

The Supreme Court decision that upheld a federal regulation regarding federally-protected horses and burros on grazing lands is Kleppe v. New Mexico. This landmark case addressed the application of the Wild Free-Roaming Horses and Burros Act of 1971, which aimed to protect these animals on public lands. The Court ruled that the federal government has the authority to manage and protect wild horses and burros, affirming the federal government’s powers under the Property Clause of the Constitution.

This ruling is significant because it emphasizes the federal government's ability to regulate resources on public lands for the protection of wildlife and biodiversity. The decision illustrated how federal law can supersede state regulations when it comes to managing natural resources, particularly those that are deemed to have national significance, such as wild horses and burros. The ruling not only affirmed the statute but also clarified the extent of federal authority in environmental protection matters.