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Originally, what is known today as New Mexico formed part of the Territorio de Nuevo Mexico (New Mexico Territory) as well as some of the Sonoran Territories (specifically, the Mesilla Valley which is now part of southern Arizona and New Mexico). Both territories belonged to Mexico.

During the Mexican-American War of 1846-1848, Mexico lost the New Mexico Territory. Later on, by means of the Gadsden Purchase in 1853, Mexico sold the Mesilla Valley to the United States.

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15y ago

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