The Supreme Court says it will hear a water dispute involving the U.S. government and the Navajo Nation. The high court said Friday it would review a lower court ruling in favor of the Navajo Nation, which spans parts of Arizona, Utah and New Mexico. The government signed treaties with the Navajo Nation in 1849 and 1868 that established the reservation. It was later expanded westward to the Colorado River, which forms the reservation’s western boundary.