For anyone seriously interested in studying American legal history, this insightful and persuasive account of the development of American law from the late 19th century to the mid-20th century is required reading. Comparing and contrasting Progressive Legal Thought with its predecessor, Classical Legal Thought, Horwitz clearly proves the impossibility of understanding the development of the American legal system separate from the broader cultural context, domestically and internationally. Building on his equally impressive earlier volume ( The Transformation of American Law , 1780-1860 , LJ 2/15/77), Horwitz provides lucid and challenging material on critical figures and events in the evolution of American law, such as Oliver Wendell Holmes, the Lochner decision, and Critical Legal Studies. Not everyone will agree with some of the conclusions, but this excellent work cannot be ignored. Especially recommended for upper-level graduate libraries.