By Ray Carlson
Arizona became part of the United States as a result of the Treaty of Guadalupe-Hidalgo that ended the Mexican-American War in 1848. The Gadsden Purchase, five years later, added additional territory needed to build a transcontinental railroad across the Deep South. The negotiations for the purchase also attempted to resolve conflicts with Mexico. The War evoked mixed reactions in the East with critics like Abraham Lincoln wondering what the US achieved.
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