Indian country jurisdiction, or the extent which tribal powers apply to legal situations in the United States, has undergone many drastic shifts since the beginning of European settlement in America. Over time, federal statutes and Supreme Court rulings have designated more or less power to tribal governments, depending on federal policy toward Indians. Numerous Supreme Court decisions have created important precedents in Indian country jurisdiction, such as Worcester v. Georgia, Oliphant v. Suquamish Tribe, Montana v. United States, and McGirt v. Oklahoma.