What are some generalizations about the 1920's?

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.