This 1853 deal that brought the U.S. chunks of New Mexico & Arizona is known in Mexico as the sale of La Mesilla
[DOC] [TLE] Gadsden Purchase - Wikipedia [PAR] The Gadsden Purchase is a 29,670-square-mile (76,800 km2) region of present-
day southern Arizona and southwestern New Mexico that was purchased by the 
United States in a treaty signed on December 30, 1853 by James Gadsden who 
was the American ambassador to Mexico at .... Southerners might have gained a 
great deal under the 1850 land grant act... [DOC] [TLE] Gadsden Purchase, 18531854 - Milestones in the History of U.S. ... [PAR] ... square mile portion of Mexico that later became part of Arizona and New 
Mexico.