; and (II) notify the Secretary of the amendment. (ii) Secretarial approval An amendment by the Fort Belknap Indian Community Council under clause (i) shall be subject to the approval of the Secretary, who shall approve the amendment by not later than 90 days after the date on which the Secretary receives notice of the amendment under clause (i)(II). (iii) Failure to respond If the Fort Belknap Indian Community Council fails to comply with clause (i), regulatory jurisdiction shall revert to the United States under paragraph (1) until the earlier of— (I) such time as the regulations of the Fort Belknap Indian Community comply with the amended Federal or State law or regulation; and (II) the date described in paragraph (5). (5) Regulation by Fort Belknap Indian Community Council Notwithstanding any other provision of law, beginning on the date that is 25 years after the date of enactment of this Act— (A) the Fort Belknap Indian Community Council may regulate the Grinnell Lands described in subsection (b)(3)(C) under, and according to, Tribal law, subject to such approval by the Secretary as may be required for any other Tribal law; and (B) the other provisions of this subsection shall not apply. (h) Environmental analysis Notwithstanding section 4(c), in preparing an environmental assessment or environmental impact statement pursuant to section 102(2) of the National Environmental Policy Act of 1969 ( 42 U.S.C. 4332(2) ) for the acquisition of State land parcels and the conveyance of Federal land under this section, the Secretary shall only be required to study, develop, and describe— (1) the proposed agency action