From GIVE ME LIBERTY, BY Eric Foner, Seagull volume 2, In Chapter 17, Eric Foner talks about the idea that the book, The Wizard of Oz, is an allegory of the times, with different characters representing different individuals or political or social groups. Based on Foner's comments in the chapter, how does the story of the Wizard of Oz help to explain what was going on in the US at the turn of the 20th century?