Which major advancement in transportation was popularized in the 1920s?

The major advancement in transportation that was popularized in the 1920s was the automobile. During this decade, the automobile industry experienced explosive growth, significantly changing American culture and society. The introduction of assembly line production techniques, most famously by Henry Ford with the Model T, allowed cars to be manufactured more efficiently and at a lower cost. This democratization of car ownership transformed transportation by making it accessible to a larger segment of the population, leading to increased personal mobility.

The rise of the automobile also influenced urban planning, infrastructure development such as highways and roads, and the growth of suburban communities. It facilitated new social and economic landscapes, including the expansion of commercial activities, leisure travel, and changes in lifestyle. The 1920s became known as the Jazz Age, characterized by the freedom and independence that owning a car provided.

In contrast, the other modes of transportation mentioned, while important in their own right, did not experience the same level of cultural and economic impact or widespread popularity during this particular decade. The steam train, while crucial for long-distance travel and freight transport, had already peaked in the earlier 20th century. The airplane was still in its infancy regarding commercial use, and although the bicycle was a popular means of transportation earlier,