American students now pledge allegiance to Mexico. They sing its na- tional an- them. And it is sanctioned by the state of Texas. Sound absurd? It is. Last month in a Spanish class at Achieve Early College High School in McAllen, Texas, students recited the Mexican pledge of allegiance and were instructed to memorize the Mexican anthem. Moreover, they had to wear red, white and green - the colors of the Mexican flag - as they fulfilled their class assignment. Public high schools no longer promote American patriotism, but they are doing a superb job of cultivating loyalty to Mexico....