What term describes a ban or restriction on trade with another country? ?

The correct answer is an embargo.

An embargo is a type of economic sanction used in foreign policy. Usually, when a country or group of countries want to punish another for some reason, uses the embargo to cut trade, either totally or partially, with that particular state or with a group of countries. It is considered a strong diplomatic measure, which seeks to trigger a reaction from the other side.

On example of such measure is the embargo was imposed by the US on Cuba, and which has been operative since 1960.

you probably know the answer. stop asking stupid questions and making me waste my time. j.k. ; )   b.t.w. what are three ratios equivalent to 5 : 11? thx