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The Supreme Court ruled Thursday that a large chunk of eastern Oklahoma remains an American Indian reservation, a decision that state and federal officials have warned could throw Oklahoma into chaos

The court's 5-4 decision, written by Justice Neil Gorsuch, means that Oklahoma prosecutors lack the authority to pursue criminal cases against American Indian defendants in parts of Oklahoma that include most of Tulsa, the second-largest city.

"Today we are asked whether the land these treaties promised remains an Indian reservation for purposes of federal criminal law. Because Congress has not said otherwise, we hold the government to its word," Gorsuch wrote in a decision joined by the court's liberal members.  

The court's ruling  casts doubt on hundreds of convictions won by local prosecutors. But Gorsuch suggested optimism.  

"In reaching our conclusion about what the law demands of us today, we do not pretend to foretell the future and we proceed well aware of the potential for cost and conflict around jurisdictional boundaries, especially ones that have gone unappreciated for so long. But it is unclear why pessimism should rule the day. With the passage of time, Oklahoma and its Tribes have proven they can work successfully together as partners," he wrote.  

The case, argued by telephone in May because of the coronavirus pandemic, revolved around an appeal by an American Indian who claimed state courts had no authority to try him for a crime committed on reservation land that belongs to the Muscogee (Creek) Nation.  

The reservation once encompassed 3 million acres (12,100 square kilometers), including most of Tulsa.

The Supreme Court, with eight justices taking part, failed to reach a decision last term when it reviewed a federal appeals court ruling in a separate case that threw out a state murder conviction and death sentence. In that case, the appeals court said the crime occurred on land assigned to the tribe before Oklahoma became a state and Congress never clearly eliminated the Creek Nation reservation it created in 1866.  

The case the justices decided Thursday involved 71-year-old Jimcy McGirt, who is serving a 500-year prison sentence for molesting a child. Oklahoma state courts rejected his argument that his case does not belong in Oklahoma courts and that federal prosecutors should instead handle his case.  

McGirt could potentially be retried in federal court, as could Patrick Murphy, who was convicted of killing a fellow tribe member in 1999 and sentenced to death. But Murphy would not face the death penalty in federal court for a crime in which prosecutors said he mutilated the victim and left him to bleed to death on the side of a country road about 80 miles southeast of Tulsa.