From KC Johnson, A Gloomy Report on the Teaching of U.S. History:
The failing of a central mission of the study of U.S. history--training future generations of American citizens--is, argues the NAS, based in a misunderstanding of the central mission of colleges and universities: that "they and particular programs within them increasingly think of themselves as responsible for reforming American society and curing it of prejudice and bigotry. When universities and university programs consider it necessary to atone for, and help erase, oppressions of the past, one way in which they do so is by depicting history as primarily a struggle of the downtrodden against rooted injustice . . . The dominance of race, class, and gender themes in history curricula came about through disciplinary mission creep. Historians and professors of United States history should return to their primary task: handing down the American story, as a whole, to future generations."