In 1803 Robert Livingston and James Monroe were sent to France to negotiate the purchase of the Louisiana Purchase. Originally the two met set out only to purchase New Orleans and the surround territory, however, by the end they eventually purchased the massive track of land that extended beyond the Mississippi River which greatly expanded the size of the United States.
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It was part of the muckraking trend in journalism and helped to keep that going. It also showed people how progressive activism could bring about change. Since, "The Jungle" did bring about reform by the Federal government.