The Oscars were pretty white this year. All 20 of the acting nominees—leading and supporting, male and female—were white, and "Selma" was notably snubbed from almost all major categories—even Best Director. Ava DuVernay, the film's director, would have been the first woman of color to be nominated in the category. And yes, she really, really deserved it. DuVernay's absence from...