Final answer:
The key factors in the development of shared popular culture in 1920s America were radio broadcasting, mass production of consumer goods, and the influence of the entertainment industry.
Step-by-step explanation:
Key factors in the development of shared popular culture during the 1920s in America included radio broadcasting, mass production of consumer goods, and the influence of the entertainment industry. The introduction of radios allowed for the widespread dissemination of music, news, and other forms of popular culture. Mass production made consumer goods like automobiles and household appliances more affordable and accessible to a larger portion of the population. The entertainment industry, particularly movies and jazz music, had a significant impact on shaping and spreading popular culture during this time.
Learn more about Shared popular culture in 1920s America