Fifteen hundred miles from the Deep South, in a central Wyoming middle school, a Confederate flag and a racial slur were scrawled on a bathroom wall.In a rural town 100 miles to the north, a teenager stood up in an assembly and gave an impersonation of Donald Trump that left a Latina student in tears. On the other side of the mountain range, in another small, tight-knit community, a middle-school student created a project on the Alamo that suggested serious violence toward Mexicans.Each of these incidents happened this …