Figure I.1. Average tariff on imports, total and dutiable, 1790–2015. (US Bureau of the Census 1975, series U-211–12 for 1790–1970; US International Trade Commission, “U.S. Imports for Consumption, Duties Collected, and Ratio of Duties to Value, 1891–2015,” March 2016, for 1970–2015.)
