How did the American legal system evolve from a static, formalistic structure into an instrument of economic and social change during the nineteenth century? Morton Horwitz, a prominent legal historian, examines the transformation of American law by analyzing the shift from a pre-industrial, agrarian legal framework to one that prioritized commercial interests and capital accumulation. Through a rigorous analysis of judicial decisions and legislative changes, the author argues that the law was not a neutral arbiter but a dynamic tool used to facilitate the transition to a market-based economy.

Legal scholars frequently cite this work as a foundational text in the Critical Legal Studies movement due to its challenge of traditional legal formalism. Readers often note the academic density of the prose, which requires a strong background in legal history to fully appreciate the author's arguments.