A history of American public schooling reduced to graphs would tell a simple story of almost continuous growth. In every category, the graphs would incline upwards, recording a steady rise in the number of students in school, the time they spent there, the teachers who taught them, the schools that housed them, and the dollars expended. The upward trend would continue unbroken from the 1820s until the 1970s. We cannot, at this time, chart the downward course that has commenced (if only temporarily) in the mid-1970s. We know only that that part of the American public that votes on school bond issues and makes its opinions known to professional pollsters is no longer willing to spend as much money or place as much trust in public schooling as it once was. It is too soon to predict the future course of public schooling in America, but a good time to reconsider the past. To understand why Americans have grown disillusioned with their public schools we must look beyond the immediate present to the larger history of the United States and its public schools. The public schools of this country—elementary, secondary, and higher—were not conceived full-blown. They have a history, and it is the social history of the United States. This essay will not attempt to present that history in its entirety but will focus instead on three specific periods decisive for the social history of this society and its public schools: the decades before the Civil War, in which the elementary or “common schools” were reformed; the decades surrounding the turn of the twentieth century, in which the secondary schools “welcomed” the “children of the plain people”; and the post-World War II decades, which found the public colleges and universities “overwhelmed” by a “tidal wave” of “non-traditional” students— those traditionally excluded from higher education by sex, race, and class. In each of these periods, the quantitative expansion of the student population was matched by a qualitative transformation of the enlarged institutions.