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 of 1833
The Tariff of 1833 was ultimately abandoned in favor of the Black Tariff of 1842, and protectionism was reinstated. Average tariff rates nearly doubled from the initial 20% target for 1842 to about 40%, and the percentage of dutiable goods jumped from about 50% of all imports to over 85% of all imports. For some goods, such as those made with iron, the import tax constituted about two thirds of the overall price of the good. Unsurprisingly, the impact of the Black Tariff of 1842 was immediate: as the cost of imports jumped, there was a sharp decline in international trade in 1843.