Oklahoma constitution
Article I: federal relations
Section 3

The people inhabiting the State do agree and declare that they forever disclaim all right and title in or to any unappropriated public lands lying within the boundaries thereof, and to all lands lying within said limits owned or held by any Indian, tribe, or nation; and that until the title to any such public land shall have been extinguished by the United States, the same shall be and remain subject to the jurisdiction, disposal, and control of the United States. Land belonging to citizens of the United States residing without the limits of the State shall never be taxed at a higher rate than the land belonging to residents thereof. No taxes shall be imposed by the State on lands or property belonging to or which may hereafter be purchased by the United States or reserved for its use.