By Graham Lee Brewer The Muscogee Nation Supreme Court ruled Wednesday that two descendants of people once enslaved by the tribe are entitled to tribal citizenship. The court found that the tribal nation’s citizenship board violated an 1866 treaty when it denied the applications of Rhonda Grayson and Jeffrey Kennedy in 2019 because they could not identify a lineal descendant of the tribe. “Are we, as a Nation, bound to treaty promises made so many years ago? Today, we answer in the affirmative, because this is what Mvskoke law demands,” the court wrote in its opinion. The Muscogee Nation is one of five tribes in Oklahoma that once practiced slavery, and in that 1866 treaty with the U.S. government, the tribe both abolished it and granted citizenship to the formerly…