8 jun 1854 ano - Gadsden Purchase

Descrição:

Region of present-day southern Arizona and southwestern New Mexico that the United States acquired from Mexico by the Treaty of Mesilla that took effect on June 8, 1854. The purchase included lands south of the Gila River and west of the Rio Grande which the U.S. needed to build a transcontinental railroad along a deep southern route, which the Southern Pacific Railroad later completed in 1881–1883.

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