Last summer, the Anderson Monarchs, the Philadelphia baseball team that became famous a year earlier when it made the Little League World Series behind pitcher Mo’ne Davis’s firepower, barnstormed through the South. They played baseball, and they also toured sites significant to the civil rights movement as a nod to the team’s heritage — it is named, after all, for the Kansas City Monarchs, the Negro leagues club for which Jackie Robinson once played. “I stood where Martin Luther King and John Lewis stood,” wrote outfielder Myles Eaddy on a team blog after a visit to Selma, Ala., adding, “It...