The National Football League’s decision to play a “Black National Anthem” before its first regular season game is a mistake that will worsen the racial tensions it seeks to relieve. Playing two anthems reinforces the idea that people with darker skin are different from “the rest of us.” So different, in fact, that “they” need “their own” anthem. Will the NFL introduce separate drinking fountains next? The league’s plan resurrects Jim Crow, a racial caste system that civil rights leaders fought and died to end and which the Supreme Court finally corrected with the reminder that “annoyances, some petty and some substantial, almost inevitably accompany segregation.” Worse yet, an unintended consequence of a “Black National Anthem” is that it hands a convenient argument to racists. If race justifies accommodation, then it can be used to justify discrimination as well. YOU CAN'T UNITE BY DIVIDING In 1968, the day after Martin Luther King Jr. was assassinated, a third-grade teacher...