Good monograph on the schism in the Jeffersonian, or "Democratic-Republican," party in Pennsylvania from the 1790s to the 1820s. Pennsylvania was the most economically developed northern state during that era, with a large population of rural freeholders and free urban "mechanics," or artisans, who combined the ideologies of classical "republicanism" (stressing virtue, civic engagement, and equality of condition) with growing classical "liberalism" (stressing individual freedom, the right to acquire property, and economic growth. These groups thus rejected the notion that acquisitiveness bred luxury, thereby corrupting republican virtue and leading to the unwarranted control of the polity by completely self-interested moneyed individuals (cf. 2015). Meantime, a third group in Pennsylvania, known as the "Tertium Quids" (or "third whats"), consisting of men in the learned professions and the growing merchant class, but who had rejected the more aristocratic Federalist party for Jeffersonianism, were more protective of acquired private property and more solicitous of "balanced" government and legal traditionalism---with a large role for the executive and judiciary---than the urban workers, who believed the democratically elected State Legislature to be paramount, and believed that democratic majorities should be empowered to break apart improvident concentrations of private wealth. The three groups---the rural Snyderites, the urban artisan Philadelphia Democrats, and the Quids---jockeyed for political supremacy over the period in question, with victory ultimately going to the Quids'/Snyderites' ideology of balance of powers, a government geared to the encouragement of private industry and agriculture, government support for private development of roads and canals, and the protection of private property from the influence of "leveling" urban radicals, with important ramifications for American history. As with many historical actors, they knew not what seeds they had planted, which, according to the author, was the marriage of classical republicanism to liberal capitalism and, most likely, the preclusion of a more socialist political economy in 19th-century America.