The Bell Curve: Intelligence and Class Structure in American Life
far above the rest of the college population.
    Taken together, these trends have stratified America according to cognitive ability.
    A perusal of Harvard’s Freshman Register for 1952 shows a class looking very much as Harvard freshman classes had always looked. Under the photographs of the well-scrubbed, mostly East Coast, overwhelminglywhite and Christian young men were home addresses from places like Philadelphia’s Main Line, the Upper East Side of New York, and Boston’s Beacon Hill. A large proportion of the class came from a handful of America’s most exclusive boarding schools; Phillips Exeter and Phillips Andover alone contributed almost 10 percent of the freshmen that year.
    And yet for all its apparent exclusivity, Harvard was not so hard to get into in the fall of 1952. An applicant’s chances of being admitted were about two out of three, and close to 90 percent if his father had gone to Harvard. 1 With this modest level of competition, it is not surprising to learn that the Harvard student body was not uniformly brilliant. In fact, the mean SAT-Verbal score of the incoming freshmen class was only 583, well above the national mean but nothing to brag about. 2 Harvard men came from a range of ability that could be duplicated in the top half of many state universities.
    Let us advance the scene to 1960. Wilbur J. Bender, Harvard’s dean of admissions, was about to leave his post and trying to sum up for the board of overseers what had happened in the eight years of his tenure. “The figures,” he wrote, “report the greatest change in Harvard admissions, and thus in the Harvard student body, in a short time—two college generations—in our recorded history.” 3 Unquestionably, suddenly, but for no obvious reason, Harvard had become a different kind of place. The proportion of the incoming students from New England had dropped by a third. Public school graduates now outnumbered private school graduates. Instead of rejecting a third of its applicants, Harvard was rejecting more than two-thirds—and the quality of those applicants had increased as well, so that many students who would have been admitted in 1952 were not even bothering to apply in 1960.
    The SAT scores at Harvard had skyrocketed. In the fall of 1960, the average verbal score was 678 and the average math score was 695, an increase of almost a hundred points for each test. The average Harvard freshman in 1952 would have placed in the bottom 10 percent of the incoming class by 1960. In eight years, Harvard had been transformed from a school primarily for the northeastern socioeconomic elite into a school populated by the brightest of the bright, drawn from all over the country.
    The story of higher education in the United States during the twentieth century is generally taken to be one of the great American successstories, and with good reason. The record was not without blemishes, but the United States led the rest of the world in opening college to a mass population of young people of ability, regardless of race, color, creed, gender, and financial resources.
    But this success story also has a paradoxically shadowy side, for education is a powerful divider and classifier. Education affects income, and income divides. Education affects occupation, and occupations divide. Education affects tastes and interests, grammar and accent, all of which divide. When access to higher education is restricted by class, race, or religion, these divisions cut across cognitive levels. But school is in itself, more immediately and directly than any other institution, the place where people of high cognitive ability excel and people of low cognitive ability fail. As America opened access to higher education, it opened up as well a revolution in the way that the American population sorted itself and divided itself. Three successively more efficient sorting processes were at work: the college population grew, it was recruited by cognitive ability more

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