Only Black Americans and apartheid South Africa sustained extreme segregation

Evidence

Thus, among US metropolitan areas with the 30 largest black populations the average dissimilarity index in 1990 was 73, down only slightly from the rather extreme value of 81 two decades earlier. In contrast, the average dissimilarity index for the 30 largest Hispanic populations was only 50, up slightly from 47 in 1970 owing to the rapid influx of Hispanic immigrants. The largest urban concentrations of Asians, meanwhile, displayed an index of just 41 in 1990, a figure that was actually down four points from 1970 despite extensive Asian immigration during the intervening period. Other than African Americans in the United States, the only documented case where a racial or ethnic group experienced prolonged, high segregation was that of black Africans in the Union of South Africa under apartheid (Christopher, 1993). — David Theo Goldberg, John Solomos, A Companion to Racial and Ethnic Studies, 2429

Categorization

• XREF: The 60-point dissimilarity threshold parallels Milgrom’s finding that institutions emerge where ordinary mechanisms fail — here discrimination forces segregation that voluntary clustering cannot produce.
• corroborated: 2 independent passages support this claim — David Theo Goldberg, John Solomos, A Companion to Racial and Ethnic Studies, 2429