D. It led to increased personal freedom and mobility. The automobile revolutionized transportation in the early 20th century, allowing individuals to travel farther and faster than ever before. With the ability to own and operate their own cars, Americans gained a new sense of independence and freedom. This led to the development of suburbs and the expansion of cities, as people were no longer confined to living close to their workplaces. Additionally, the automobile industry created new jobs and stimulated economic growth, contributing to the overall prosperity of the nation.