Explain how U.S. policymakers seek to stimulate the economy and integrate the trans-Mississippi west into the nation, and how did this affect people living there?

Explain how U.S. policymakers seek to stimulate the economy and integrate the trans-Mississippi west into the nation, and how did this affect people living there?

You must refer to at least one of the document sources.
source to use is below:
Title of source-Document 15-2 | Railroad Transforms the Nation
CURRIER & IVES, Across the Continent (1868)
Source-For better or worse, the railroad altered the geography of America and ushered in economic, social, and political changes that touched the lives of nearly all Americans. Like the canal era before it, the period of rapid railroad development promised market expansions as goods and resources crossed the continent and local economies integrated with national and global trade networks. Once-isolated communities found themselves connected to consumer and communication webs hardly imagined in the horse-and-wagon days. This image, produced by the printmaking firm Currier & Ives and captioned “Across the Continent: ‘Westward the Course of Empire Takes Its Way,’” captures this expansion at its beginning, with the anticipation and foreboding it inspired.

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