2-1-303. Date of assumption of jurisdiction -- application of state law in Indian country. Sixty days from the date of issuance of the proclamation of the governor as provided for by 2-1-302, the state of Montana shall assume jurisdiction over offenses committed by or against Indians in the lands prescribed in the proclamation to the same extent that this state has jurisdiction over offenses committed elsewhere within this state. The criminal and/or civil laws of this state shall have the same force and effect within such lands as they have elsewhere within this state.