Traditional accounts of U.S. tariff policy emphasize trade strategies and interest group politics. This article makes a departure. It opens with an observation: up until World War I, the tariff was the largest single source of federal government revenues. It then explores the significance of tariffs as taxes, theoretically and empirically.
In its first part, the article develops a theory of taxation politics and applies it to the tariff. In its second part, it submits the theory to an empirical test, modeling changes in U.S. tariff rates from 1829 to 1940. The politics of tariff revision, it argues, followed from two characteristics of the tariff as tax: from the extent of the treasury's dependence upon it and from the distributive pattern of its burdens and benefits. Taken together, the article concludes, revenue dependence and distributive incidence account for several diverse aspects of American tariff policy, including the structure of its coalitions, the shifts in its objectives, and the timing of its innovations.