The rise of schooling, from a peripheral activity of religious groups and some elites to a virtually universal and global experience of nearly all children, has been the object of study for over a century. Socialization, usually accomplished within the family, is how young people were traditionally brought into the skills and knowledge required by adult status. A few were chosen for more specialized and formalized education, among them priests, but “going to school” was a very uncommon human experience until the 19th century in the United States, when the “common school movement” established schools in rural areas and cities. By the second half of the 19th century, mass elementary schooling was in place and the expansion of “comprehensive” secondary education had begun. After World War II, a similar pattern of growth in higher education began to take shape. Increasingly called “postsecondary schooling,” the kinds of organizations offering this level of education were diverse, with a large expansion of public institutions, two- and four-year degree programs, and a robust private sector. As this expansion has taken place, the content of schooling, as well as the forms it has assumed, has grown. The questions scholars have asked about this phenomenon include “why has it taken place?” and “what are its consequences?” This article will focus on the literature documenting the expansion of schooling in the United States, the explanations that have been developed for this expansion, and assessments of its consequences. “Functional” (including human capital) explanations have stressed the technical demands of the labor market as the economy has moved from one based on extraction of resources (like farming) to manufacturing, and on to service activities. This view asserts that formal schooling needed to be expanded to transfer the cognitive skills required to attain independent adult status in the new economy. Alternatively, “conflict” theories see education as a tool used by competing groups to exclude nonmembers from eligibility for positions that provide high rewards. Dominant groups shape educational expectations and content in ways that privilege their own members, thus sustaining their dominance. Finally, “neo-institutional” explanations emphasize how education has become the chief legitimate mechanism for selection of people to adult statuses in society. These perspectives include a vast literature into which this essay will provide entrée. After assaying the theoretical literature, this report will examine the consequences of educational expansion for some specific educational topics, including early childhood education, the “college for all” movement, women in higher education, and the rise of community colleges and for-profit colleges.