His main areas of expertise are Latin America, social stratification, polling and more specifically the American class structure.
He has been covering the socio-economic class structure of the United States in five volumes since 1978.
The term commonly includes the so-called "blue bloods" (multi-generational wealth combined with leadership of high society) such as the Astor or Roosevelt families.
Events of the past decade have given Warner's work new relevance, particularly to study of Social class in the United States.
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