Prior to 1990, the united states imposed a tax, known as a(n) on automobiles imported from mexico.

Tariff.

Explanation:

A tariff is a tax imposed on the importation of products form other countries, in the case of Mexico, and Canada after the 90´s they´ve signed NAFTA along with the american government, this gave rights of export and import with little to no tariffs imposed on products originted between this three countries.

sorry i tried to but i didn’t get it