In this concise history of the Louisiana Purchase, renowned presidential scholar Lara M. Brown explores how Thomas Jefferson’s skilled diplomacy and political strategy helped secure the historic bargain and changed the course of American history. Thomas Jefferson is one of the more inscrutable characters in American history. While he is best known for the Declaration of Independence and his conflicting legacy on race and slavery, his pursuit of the Louisiana Purchase was a crucial decision for the trajectory of the country and the development of the presidency. In this volume of the Landmark Presidential Decisions series Lara M. Brown casts Jefferson as a shrewd and calculating politician. Brown examines the historical and political circumstances that led to the Louisiana Purchase, in which Jefferson’s inclination to pursue a strategy of misinformation and patient persuasion rather than engaging in a direct confrontation or a show of force with Napoleon helped to transform a series of accidents into a historic moment of luck. In addition to exploring the international politics and domestic pressures that helped bring about this deal, Brown examines the larger theoretical issues related to the presidency itself. While Jefferson expressed concern about the constitutionality of the agreement and briefly considered passing a constitutional amendment, his decision to follow Madison’s advice and move quickly on the purchase established the “national emergency” rationale upon which the “imperial presidency” was partly constructed. Moreover, Jefferson relied on American ministers to act as his representatives in executing the deal, underlining the importance of governance, communication, and the management of a burgeoning executive branch. The Louisiana Purchase is essential to understanding territorial expansion, foreign policy in the early republic, and the perennial political dilemmas surrounding the ambiguity of Article II in the Constitution. Lara Brown expertly guides readers through one of the most consequential decisions in early American history.