John Bartlett of Rhode Island, the U.S. negotiator, agreed to allow Mexico to retain the Mesilla Valley (and thus maintain the border at 32-22` N, north of the U.S. claim 31-52` and in the eastern part, also north of the border claimed by Mexico at 32-15 degrees ). believed to have rich deposits of copper and some deposits of silver and gold that had not yet been mined. The countries of the South rejected this alternative because of its impact on the railways, but President Fillmore supported it. Southern congressional countries have prevented any approval of the separate border treaty and eliminated other funds for surveying the controversial border country. Robert B. Campbell, an Alabama railroad politician, later replaced Bartlett. Mexico stated that the commissioners` determinations were valid and ready to send troops to enforce the un ratified agreement.  The South Pacific portion of Arizona was originally largely at Gadsden Purchase, but the western part was later diverted north of the Gila River to serve the city of Phoenix (as part of the EP-SW purchase agreement). The part of New Mexico runs through much of the area that has been the shadow of a controversy between Mexico and the United States after the Guadalupe Hidalgo Treaty came into force and before the purchase of Gadden. In August 1883, the Santa Fe Railroad Company built a railway line via Holbrook, Winslow, Flagstaff and Kingman.  These two transcontinental railways, the Southern Pacific (now part of the Union Pacific Railroad) and the Santa Fe (now part of the BNSF), are among the busiest rail lines in the United States.
20Mexikos The legislature refused to ratify the agreement, believing that the Texan`s independence was the first step in the U.S. expansion to the Southwest. See Weber, Ed., Foreigners in Their Native Land: Historical Roots of the Mexican Americans: 114-115. Although the Adams-Ons agreement resolved one point of friction, it created others. Critics have accused President James Monroe and Secretary of State Adams of making legitimate claims in Texas, fueling subsequent calls for “reamion” in Texas, particularly from supporters of slavery in the 1830s. In addition, the Adams-Ons Treaty confirmed the Mexican possession of land that, during the war with Mexico from 1846 to 1848, was to become the target of American expansion. The Gadsden Purchase Agreement was an agreement between the United States and Mexico in 1854 in which the United States agreed to pay Mexico $10 million for a portion of 29,670 km2 of Mexico, which was later part of Arizona and New Mexico.