The South remains the most desegregated region in the country for black students, but along every measure of segregation and at each level of geography, gains made during the desegregation era are slipping away at a steady pace. This report shows that the segregation of Southern black students has been progressively increasing since judicial retrenchment on "Brown" began in the early 1990s. Though the Supreme Court granted desegregation rights to Latino students in the 1973 "Keyes" case, many Southern desegregation plans were dissolved without ever recognizing Latino rights. Latino students in the South were seldom included in desegregation orders, and have undergone increases along multiple measures of segregation over the past four decades. Black and Latino students in the South attend schools defined by double isolation by both race and poverty. The South reports high overall shares of students living in poverty, but students of different racial backgrounds are not exposed equally to existing poverty. The typical black and Latino student in the region goes to a school with far higher concentrations of low-income students than the typical white or Asian student. In this report, the authors present an in-depth treatment of Southern trends that are merely summarized in the accompanying larger report, "E Pluribus... Segregation." Key findings are highlighted. Appended are: (1) Data Sources and Methodology; and (2) Additional Data Tables. (Contains 4 figures, 21 tables and 55 footnotes.) [For the main report, ""E Pluribus"... Separation: Deepening Double Segregation for More Students," see ED535442. For related report, "Western States: Profound Diversity but Severe Segregation for Latino Students," see ED535610.]