This thesis examines John C. Calhoun's shift from a more nationalist to a more states' rights position. The study explores the evolution of his thought from the War of 1812 until the early 1830s. Using the debate surrounding the policy issues of the National Bank, internal improvements and protective tariffs as markers along this timeline, the thesis examines Calhoun's writings regarding each of these issues, highlighting any changes or consistencies; more specifically, it explores the relationship between Calhoun's shift in position and the issues and events of the era.