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 boundaries, and inadequate state and federal procedures. He argued many precedent-setting cases, some of them before the U.S. Supreme Court. Maurice Baxter contends that Clay's extensive legal work in this area greatly influenced his political stances on various land policy issues. During Clay's lifetime, property law also included questions pertaining to slavery. With Daniel Webster, he handled a very significant constitutional case concerning the interstate slave trade. Baxter provides an overview of the federal and state court systems of Clay's time. After addressing Clay's early legal career, he focuses on Clay's interest in banking issues, land-related economic matters, and the slave trade. The portrait of Clay that emerges from this inquiry shows a skilled lawyer who was deeply involved with the central legal and economic issues of his day.