* Created a national culture. Before radio, most Americans received their news and entertainment from local newspapers and radio stations. This meant that people in different parts of the country had very different experiences of American culture. Radio changed this by bringing the same programming to people all over the country. For example, the NBC radio network broadcast news, sports, and entertainment programs that could be heard by millions of people at the same time.
* Changed the way people spent their time. Before radio, people spent most of their free time socializing with friends and family, or reading, going to the movies, or listening to music. Radio gave people something to do in their spare time. They could listen to the radio while they were doing other things, such as cooking, cleaning, or commuting.
* Influenced how people thought and felt. Radio programs often portrayed idealized versions of American life. For example, the popular soap opera "Amos 'n' Andy" depicted a close-knit, African-American family. These programs helped to shape people's ideas about what constituted a "normal" life.
Film
* Became a major form of entertainment. By the end of the 1920s, movies were the most popular form of entertainment in the United States. People of all ages and social classes went to the movies.
* Changed the way people saw the world. Movies gave people a chance to see different cultures and lifestyles. For example, the film "The Birth of a Nation" (1915) gave white Americans a sympathetic view of the Ku Klux Klan.
* Helped to create a mass culture. Movies brought people together from all walks of life. They shared a common experience when they went to the movies. This helped to create a sense of national identity.
In conclusion, the growth of radio and film in the 1920s had a profound impact on American society and culture. These new media technologies created a national culture, changed the way people spent their time, and influenced how people thought and felt. They also helped to create a mass culture that brought people together from all walks of life.