The Supreme Court has news for people who reside in what is roughly the eastern half of Oklahoma: They are living on an American Indian reservation. In a 5-4 ruling Thursday, the court ruled that the land, including Tulsa, falls within the Muscogee (Creek) Indian Reservation, reports the Wall Street Journal. The central question was whether Oklahoma's statehood in 1907 dissolved the reservation, and the court ruled that it did not. The New York Times calls it "one of the most consequential legal victories for Native Americans in decades." The impact? It will mostly affect the prosecution of crimes against Native Americans on the reservation, and could extend to civil matters as well, per the Oklahoman. Specifically, the ruling overturns the conviction in state court of a Native American man convicted of molesting a child. The man had argued that the state had no authority to try him and that his case should have been handled in federal court; that may now happen, per the AP.