what type of tariff is prohibited by the u.s. constitution
Tariffs in United States history During the Revolution, the British blockade from 1775 to 1783 largely ended foreign trade. In the 1783â€“89 Confederation Period, each state set up its own trade rules, often imposing tariffs or restrictions on neighboring states. The new Constitution, which went into effect in 1789, banned interstate tariffs or trade restrictions, as well as state taxes on exports.[17]