What was the main reason that the United States bought the Gadsden Purchase

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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Explanation:

Religious Tolerance is the correct answer. John Locke, one of the great Enlightenment philosophers supported the separation of church and state and promoted religious toleration. He opined that everyone should have the religious freedom and liberty to choose his belief.