Though he was best known as a politician, Henry Clay (1777-1852) maintained an active legal practice for more than fifty years. He was a leading contributor both to the early development of the U.S. legal system and to the interaction between law and politics in pre-Civil War America.

During the years of Clay's practice, modern American law was taking shape, building on the English experience but working out the new rules and precedents that a changing and growing society required. Clay specialized in property law, a natural choice at a time of entangled land claims, ill-defined...

This detailed study of Henry Clay and the American System -- a program of vigorous economic nationalism dependent on active government and constitutional aspects of what was perhaps Clay's greatest contribution to national policy, a contribution that has received surprisingly little study until now.

During the first half of the nineteenth century the new United States experienced rapid material growth, transforming a largely agrarian, pre-modern economy into a diversified, industrializing one. As Speaker of the House in the years following the War of 1812, and later as founder of the...