A high school student in Arkansas was blocked from receiving sole valedictorian honors this summer, despite earning the highest G.P.A. in her class and receiving only a single B in her four years at McGehee Secondary School. Kymberly Wimberly’s offense? She’s black. School administrators worried that Wimberly’s accomplishment would result in a “big mess” at the majority-white school, so Principal Darrell Thompson told the student’s mother “that he decided to name a white student as co-valedictorian,” even though the white student had a lower G.P.A. The matter is currently pending in federal court.