“ With regard to the particular question of the extension of state jurisdiction over civil causes of action by or against Indians arising in Indian country, there was, at the time of the Tribal Council resolution, a 'governing Act of Congress,' i.e., the Act of 1953. Section 7 of that statute conditioned the assumption of state jurisdiction on 'affirmative legislative action' by the State; the Act made no provision whatsoever for tribal consent, either as a necessary or sufficient condition to the assumption of state jurisdiction. ”

“ In July and August of 1964, petitioners purchased some food on credit from a grocery store located within the town limits of Browning, a town incorporated under the laws of Montana but located within the exterior boundaries of the Blackfeet Reservation. ”

“ Title IV of the 1968 Act was offered and principally sponsored by Senator Ervin of North Carolina as part of an amendment by way of a substitute to H.R. 2516, which eventually became part of the Civil Rights Act of 1968. ”