Why did the United States buy the Gadsden Purchase in 1853?
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The purpose of the 1853 Gadsden Purchase was to acquire land for the United States that could be used to construct a transcontinental railroad.

Explanation:

The Gadsden's Purchase provided the land necessary for a southern transcontinental railroad and attempted to resolve conflicts that lingered after the Mexican-American War.

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the answer to fill in the blank in this question would be the word resource, it is defined as the money, material or people (since human resource is a very valuable good) that a company or a person has at disposition (meaning they can use the resource as they see fit), to be able to complete a task or achieve a goal.  

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