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Upton Sinclair's The Jungle. Upton Sinclairs book The Jungle, published in 1906, helped advance the Progressive Era. Sinclairs book was aimed at convincing the readers that socialism was far better than capitalism, but instead the readers focused on the abuses of the meat-packing industry.
Books that Changed History. The Jungle and the Progressive Era. The publication of Upton Sinclairâs 1906 novel The Jungle produced an immediate and powerful effect on Americans and on federal policy, but Sinclair had hoped to achieve a very different result.