Washington State Dep't of Licensing v. Cougar Den, Inc., 586 U.S. ___ (2019), was a United States Supreme Court case in which the Court held that the Yakama Nation Treaty of 1855 preempts the state law which the State purported to be able to tax fuel purchased by a tribal corporation for sale to tribal members. This was a 5-4 plurality decision, with Justice Breyer's opinion being joined by Justices Sotomayor and Kagan. Justice Gorsuch, joined by Justice Ginsburg, penned a concurring opinion. There were dissenting opinions by Chief Justice Roberts and Justice Kavanaugh.