Assuming that you are talking about the 1920s in the United States, the main generalization about this time is that it was the "Roaring '20s." This implies that it was a time when people had lots of leisure time and did a lot of things for fun. It also implies that the US economy was roaring.
In other words, that implies the following generalizations:
- Most Americans had more time for having fun rather than working.
- Most Americans liked to go to speakeasies and drink illegal alcohol and listen to jazz.
- Most American women were flappers and/or believed in new visions of morality and what was proper conduct.
- Most Americans were getting richer because of the booming stock market.
People who know a bit more about history have a second set of generalizations. These would include:
- Most rural Americans disliked the new ways.
- Many Americans were worried about how much immigration was going on in this time.
Overall then, the generalizations center around the idea that this was a boom time of economic growth and people having lots of fun. There are also generalizations about the idea that rural, traditional people were concerned about the changes.