Final answer:
The United States faced a change in social trends, a move toward prosperity, and a concern about the standard of living as the 1920s began.
Step-by-step explanation:
The important issues that the nation faced as the 1920s began were a change in social trends, a move toward prosperity, and a concern about the standard of living.
As the decade started, there was a shift in social trends, with a more modernist, urban culture emerging and conflicting with the traditionalist, rural culture. Additionally, there was a move toward prosperity as the economy experienced growth, but problems such as overproduction in agriculture and trouble in important industries threatened the nation's economy. Lastly, there was a concern about the standard of living, with issues of unemployment, dangerous working conditions, and political corruption needing to be addressed.