Gives Utah state courts the power to hear civil lawsuits that name the Shivwits Band of Paiutes as a party when the dispute arises on the Tribe’s Indian lands, clarifies that contracts/leases involving the Band fall under certain federal definitions, and treats contract disputes as federal-question civil actions. The Act expressly preserves the Shivwits Band’s sovereign immunity (and its ability to waive immunity) and updates a statutory leasing provision for the Band, though the exact lease-language change is not shown.