Question: Education

He actually could'nt get his message across.  Sinclair tried to prove that Socialism is better than Capitalism.  What actually happened is that he only succeeded in showing the weaknesses in Capitalism, which the US government of the early 1900s quickly repaired.  Therefore Sinclair's book actually helped remove the power of the Socialist agenda in the US by fixing some of the flaws with Capitalism and therefore making it stronger... whoops...

Sinclair used his story telling ability to explain his views of socialism. Although everything was not adopted by the US, some of these ideas did sink in. He also exposed the American public to the ideas of socialism and helped to educate the public about its concepts.