In the aftermath of World War I, the United States turned its attention to mass producing goods and greatly expanding its consumer society. New technologies that had been limited before the war began to spread widely afterwards. A chief example is the automobile. Still an elite item before World War I, in the 1920s, Ford's mass production of the affordable Model T brought automobiles into the mainstream. Cars gave people much more power over where they lived and where they went than mass transit had.
Food processing technologies were developed and improved upon during World War I, and these innovations impacted US society in the 1920s with the introduction of foods such as canned pork and beans, kool-Aid, and mass produced jellies and peanut butter. These convenience foods meant that women had to spend less time in the kitchen. The invention of the electric refrigerator in the 1920s also eased the burden on the American housewife.
Radio, developed during World War I, also spread widely as a consumer item during the 1920s. This helped unify a mass consumer culture as people across the country listened to the same songs, news broadcasts, and entertainment shows. Radio is, for example, credited with helping to spread a standard US dialect as people imitated broadcasters' accents.
With cars, telephones, refrigeration, processed food, electricity, and mass communication through radios becoming common, the 1920s for the first time created a consumer culture recognizably like the one we live in today.