Whether the Assimilative Crimes Act applies to Indian country

QUESTION PRESENTED Whether the Assimilative Crimes Act, 18 U.S.C. §13, applies to Indian country—either on its own or through the General Crimes Act, 18 U.S.C. §1152—such that the federal government may prosecute Indians for virtually any state-law offense committed in Indian country, including on lands promised by treaty for the “exclusive use” of Indian tribes. @