ned up everywhere. With such a wealthy upper-class many luxury hotels were needed. In 1924 alone, hotels such as the Mayflower (Washington D.C.), the Parker House (Boston), The Palmer House (Chicago), and the Peabody (Memphis) opened their doors(end note 25). Lastly, and possibly most importantly, the construction industry benefited tremendously from the automobile. With the growing number of cars, there was a big demand for paved roads. During the 1920's Americans spent more than a $1 billion each year on the construction and maintenance of highways, and at least another $400 million annually for city streets(end note 26). But the automotive industry affected construction far more than that. The automobile had been central to the urbanization of the country in the 1920's because so many other industries relied upon it. With urbanization came the need to build many more apartment buildings, factories, offices, and stores. From 1919 to 1928 the construction industry grew by around $5 billion dollars, nearly 50%(end note 27). Also prospering during the 1920's were businesses dependent upon the radio business. Radio stations, electronic stores, and electricity companies all needed the radio to survive, and relied upon the constant growth of the radio market to expand and grow themselves. By 1930, 40% of American families had radios(end note 28). In 1926 major broadcasting companies started appearing, such as the National Broadcasting Company. The advertising industry was also becoming heavily reliant upon the radio both as a product to be advertised, and as a method of advertising. Several factors lead to the concentration of wealth and prosperity into the automotive and radio industries. First, during World War I both the automobile and the radio were significantly improved upon. Both had existed before, but radio had been mostly experimental. Due to the demands of the war, by 1920 automobiles, radios, and the parts necessary to...
