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.
Tariff in United States history
Tariffs soon became a major political issue as the Whigs (1832–1852) and (after 1854) the Republicans wanted to protect their mostly northern industries and constituents by voting for higher tariffs and the Southern Democrats, which had very little industry but imported many goods voted for lower tariffs. Each party as it came into power voted to raise or lower tariffs under the constraints that the Federal Government always needed a certain level of revenues. The United States public debt was paid off in 1834 and President Andrew Jackson, a strong Southern Democrat, oversaw the cutting of the tariff rates roughly in half and eliminating nearly all federal excise taxes in about 1835.