<Tr> <Td> United States portal </Td> </Tr> <Tr> <Td> <Ul> <Li> </Li> <Li> </Li> <Li> </Li> </Ul> </Td> </Tr> <Ul> <Li> </Li> <Li> </Li> <Li> </Li> </Ul> <P> The tariff history of the United States spans from colonial times to present . The first tariff law passed by the U.S. Congress, acting under the then recently ratified Constitution, was the Tariff of 1789 . Its purpose was to generate revenue for the federal government (to run the government and to pay the interest on its debt), and also to act as a protective barrier around domestic industries . An Import tax was collected by treasury agents before goods could be landed at U.S. ports . </P>

What was the impact of 1920s tariffs on world trade