3. How did a barrio develop in Los
Angeles during the 1920s?

The correct answer is Migrant workers from Mexico took jobs there

Explanation: In this sense it is possible to understand that immigrants played a major role in the development of some neighborhoods in the united states, immigrants helped to develop their specifies and ways of living as well as a very important fusion of culture for the country.

i think it would be reparing roads  

the tariff was created to protect industry in the northern part of the united states. industries in the north were being driven out of business by imported goods that were priced at a low rate. the goal was to protect these industries   by taxing the goods.