Book excerpt: Americans choose from a dizzying array of schools, loosely categorized as "public" and "private." How did these distinctions emerge, and what do they tell us about the relationship in the United States between public authority and private enterprise? Challenged by the rise of Catholic and other parochial schools in the nineteenth century, states sought to protect the public school monopoly through regulation. Ultimately, however, Robert N. Gross shows how the public policies that resulted produced a stable educational marketplace, where choice flourished.