What did the US government do to make sure that business was booming in the 1920’s?

Fordney – McCumber Tarriff Act in 1922 (tariffs imposed on goods)

Explanation:

The Republican governments of Presidents Harding, Coolidge and Hoover, tried to help American businesses by increasing taxes on foreign goods coming into the USA. This was achieved by passing a new law called the Fordney – McCumber Tarriff Act in 1922. These new import taxes were called ‘Tariffs’ and made goods that were made outside of the USA more expensive to buy. This in turn encouraged Americans to buy goods made in the USA. This led to a Boom or an increase in the amount of goods being made and sold by American businesses.

from the conditions of the working class in england by friedrich engels,the main idea is :

the answer is a, salt plain