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In the fall of 1856 Gadsden retired as minister to Mexico, and returned to Charleston where he died in 1858. The sectional crisis of the late 1850s and subsequent Civil War delayed construction of a proposed southern transcontinental railroad to California along the 32d parallel, just to the north of the Mexican border. Between 1878 and 1881, though, the Southern Pacific Railroad (now part of the Union Pacific Railroad) built the section of the southern transcontinental between Yuma and El Paso within the Gadsden Purchase territory. At the same time, 1880-1882, the Atchison, Topeka and Santa Fe Railroad completed a transcontinental link through the Gadsden Purchase and then southwest to a terminus at the port of Guaymas, in the state of Sonora, Mexico. Completed October 25, 1882, this line was later acquired by the Southern Pacific. Today, the rail link across the Gadsden Purchase on the southern transcontinental is one of the busiest in the Western Hemisphere.