The Federal-Aid Highway Act of 1956 and the growth of suburbs both had a negative impact on

The 1956 Federal-Aid Highway Act funded a huge network of highways, making it easier for people to live farther from city centers and commute by car. As suburbs grew, businesses and residents moved out of many urban areas, contributing to population loss and declining investment in cities. Thus, the negative impact was on the nation’s cities.

AI-written and checked against the verified answer.