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The Gadsden Purchase did all of the following EXCEPT:
Force the raising of tariffs.
Demonstrated yet again to Northerners the role of the "Slave Power" exerted in the federal government in ways that did not benefit them.
Lay the groundwork for a transcontinental railroad with a Southern route of New Orleans to San Francisco.
Complete the contiguous continental expansion of the US.
Solved border issues still remaining from the Treaty of Guadalupe Hidalgo.