What was the impact of automobiles in the 1920s?

That is like asking what is the impact of medicine?

haha just kidding. Automobiles reinvented technology. It allowed us to drive, instead of walk or ride horses. we are allowed to get to places easier and faster and more efficient. 

The growth of the AUTOMOBILE INDUSTRY caused an economic revolution across the United States. Dozens of spin-off industries blossomed. Of course the demand for vulcanized rubber skyrocketed. Road construction created thousands of new jobs, as state and local governments began funding highway design.

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

manchester's leaders hoped to oppress its working class to benefit factory owners.

If this is a true or false question the answer is true.