When Guadalupe V. Aguayo puts her hand to her heart, faces the American flag in the corner of her classroom and leads her second-graders in the Pledge of Allegiance, she says some of the words—like allegiance, republic and indivisible—with a noticeable accent, reports the New York Times. When she tells her mostly Latino students to finish their breakfasts, quiet down, pull out their homework or capitalize the first letter in a sentence, the same accent can be heard…