Tariff
A tariff is called an optimal tariff if it's set to maximize the welfare of the country imposing the tariff. It is a tariff derived by the intersection between the "trade indifference curve" of that country and the offer curve of another country. In this case, the welfare of the other country grows worse simultaneously, thus the policy is a kind of "beggar thy neighbor policy". If the offer curve of the other country is a line through the origin point, the original country is in the "condition of a small country", so any tariff worsens the welfare of the original country.
History of taxation in the United States
When Alexander Hamilton was the United States Secretary of the Treasury he issued the Report on Manufactures, which reasoned that applying tariffs in moderation, in addition to raising revenue to fund the federal government, would also encourage domestic manufacturing and growth of the economy by applying the funds raised in part towards subsidies (called bounties in his time) to manufacturers. The main purposes sought by Hamilton through the tariff were to: (1) protect American infant industry for a short term until it could compete; (2) raise revenue to pay the expenses of government; (3) raise revenue to directly support manufacturing through bounties (subsidies). This resulted in the passage of three tariffs by Congress, the Tariff of 1789, the Tariff of 1790, and the Tariff of 1792 which progressively increased tariffs.