Tariff
A tariff is a tax on imports or exports between sovereign states. It is a form of regulation of foreign trade. It is a policy that taxes foreign products to encourage or protect domestic industry. It helps limit trade deficits. The tariff is historically used to protect infant industries and to allow import substitution industrialization.
Walker tariff
The Walker Tariff was a set of tariff rates adopted by the United States in 1846. The Walker Tariff was enacted by the Democrats, and made substantial cuts in the high rates of the "Black Tariff" of 1842, enacted by the Whigs. It was based on a report by Secretary of the Treasury Robert J. Walker. The Walker Tariff reduced tariff rates from 32% to 25%; it coincided with Britain's repeal of the Corn Laws and led to an increase in trade. It was one of the lowest tariffs in American history.