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The Osage Nation Legislature hereby affirmatively declares, asserts, and extends the jurisdiction of the Osage Nation over the Osage Indian Reservation and all Indian country, as defined in 18 U.S.C. § 1151, within the exterior boundaries of the Osage Indian Reservation, as described in the Act of June 5, 1872, 17 Stat. 220, except that portion purchased by the Kaws. ONCA 11-41, eff. Apr. 12, 2011.