Montana Constitution, Article I
COMPACT WITH THE UNITED STATES. All provisions of the enabling act of Congress (approved February 22, 1889, 25 Stat. 676), as amended and of Ordinance No. 1, appended to the Constitution of the state of Montana and approved February 22, 1889, including the agreement and declaration that all lands owned or held by any Indian or Indian tribes shall remain under the absolute jurisdiction and control of the congress of the United States, continue in full force and effect until revoked by the consent of the United States and the people of Montana. 