Final answer:
A tariff is a tax on certain goods, both imports and exports. It was called "protective" in the 1800s because it aimed to protect American manufacturers from foreign competition by making imported goods more expensive.
Step-by-step explanation:
A tariff is a tax on certain goods, both imports and exports. It was sometimes called "protective" during the antebellum time period (1800s) because it aimed to protect American manufacturers from foreign competition. By making imported goods more expensive, tariffs made it cost-prohibitive for consumers to buy anything other than American-made goods, which in turn increased the profits of American manufacturers.