Although this article mentions racism later on, it would be interesting to see the distribution of various ethnicities among the ladders and levels mentioned in

Although this article mentions racism later on, it would be interesting to see the distribution of various ethnicities among the ladders and levels mentioned in the first part of the article -- many people outside the U.S. view it as a 4-caste society made up of Caucasian, Asian, Black, and Hispanic, with an underclass of Muslim "untouchables".