Question

What was one effect of the popularity of the automobile on the U.S economy

Answer 1

Here is my answer to your question: One of the effects of the popularity of the automobile on the United States economy is it is growing especially the industry boomed after World War I. The industry provided more jobs, more consumers which the demand was also high. Given this, the industry has contributed to the economy.

Answer 2

One effect of the popularity of the automobile on the U.S economy is : more workers were needed in the industries that made related parts.
The increase in the popularity will increase the total market demand of the products, which lead to and increase of needed workers fot the automobile industry

hope this helps