Celebrating diversity has become one of the main goals of American schools. Students are being taught to think of themselves primarily as members of different ethnic groups, while being discouraged from developing an American identity. Consider the case of Mount Diablo High School in Concord, California. Mount Diablo's website states that students will "celebrate diversity by being respectful to all walks of life." In keeping with that ethos, last month the school divided students by ethnicity for separate assemblies. School officials explained that the purpose of segregating the students was to talk about test scores, recognize achievements and celebrate different...