Final answer:
The 1920s in the U.S. were marked by the rise of jazz, the 'flapper', and consumerism, significant political changes post-WWI, and robust economic growth. This period also saw social conflicts arise between modern and traditional values, setting the stage for the Great Depression.
Step-by-step explanation:
The 1920s in the United States was a period marked by significant cultural, political, and economic changes. Culturally, the era is known for the rise of jazz music, the fashion of the 'flapper', and a general shift towards a consumer-driven society. Politically, the period saw the emergence of new policies and changes in government with the aftermath of World War I still fresh in the public consciousness. Economically, the 1920s was characterized by dramatic growth with the average Gross National Product (GNP) increasing by 4.2% each year, driven by industrial output and technological advancements such as the widespread availability of the Model T automobile. However, these years of prosperity were also a time of social conflict between modernist urban values and traditional rural ones, and eventually led to the hardships of the Great Depression, which starkly contrasted with the preceding decade's exuberance.