Opinion of the Court
Notice: This opinion is subject to formal revision before publication in the preliminary print of the United States Reports. Readers are requested to notify the Reporter of Decisions, Supreme Court of the United States, Washington, D. C. 20543, of any typographical or other formal errors, in order that corrections may be made before the preliminary print goes to press.
SUPREME COURT OF THE UNITED STATES
No. 16–1498
WASHINGTON STATE DEPARTMENT OF LICENSING, PETITIONER v. COUGAR DEN, INC.
ON WRIT OF CERTIORARI TO THE SUPREME COURT OF WASHINGTON
[March 19, 2019]
Justice Breyer announced the judgment of the Court, and delivered an opinion, in which Justice Sotomayor and Justice Kagan join.
The State of Washington imposes a tax upon fuel importers who travel by public highway. The question before us is whether an 1855 treaty between the United States and the Yakama Nation forbids the State of Washington to impose that tax upon fuel importers who are members of the Yakama Nation. We conclude that it does, and we affirm the Washington Supreme Court’s similar decision.
I
A
A Washington statute applies to “motor vehicle fuel importer[s]” who bring large quantities of fuel into the State by “ground transportation” such as a “railcar, trailer, [or] truck.” Wash. Rev. Code §§82.36.010(4), (12), (16) (2012). The statute requires each fuel importer to obtain a license, and it says that a fuel tax will be “levied and imposed upon motor vehicle fuel licensees” for “each gallon of motor vehicle fuel” that the licensee brings into the State. §§82.36.020(1), (2)(c). Licensed fuel importers who
