sentences:  His academic work focused on social history and American social, political and economic elite and power structures, especially as it relates to immigration, ethnic conflict and national identity.Fox's publications have been reprinted due to their prescient nature, including "The Decline of Aristocracy in the Politics of New York" (1919, repr.1971); a biography of Herbert L. Osgood (his father-in-law); and "Yankees and Yorkers" (1940, 1989).