What some descriptive phrases that characterize the United States and Europe after WWI?

There are
many possible phrases that could be used, with different phrases to describe the US and various
countries in Europe.  As some examples, we could use:

• Idealistic
  and pacificistic.  This would describe the US and many European countries.  This is why they
  made treaties like the Kellogg-Briand Pact.
• Economically devastated.  This
  could apply to Germany more than any country since much of its wealth was taken to pay for the
  damages from the war.
• Full of political unrest.  This would apply most to
  Russia and Germany.  However, you could apply it a bit to the US where there was a "Red
  Scare" in the time immediately after WWI.