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The Eastern part of the State was acquired from Texas as a part of the Compromise of 1850 following the Mexican-American War. That war and the Treaty of Guadalupe Hidalgo resulted in the aquistion of California, much of Arizona and New Mexico. The final portions were purchased from Mexico in the form of the Gadsden Purchase, which established the Southern border of New Mexico and the current State of Arizona. Finally, the Western half of the State was used to form Arizona Territory in 1863.

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13y ago

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