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U.S. Department of State, U.S. Department of State, history.state.gov/milestones/1830-1860/gadsden-purchase.
“The Gadsden Purchase.” History Today, www.historytoday.com/richard-cavendish/gadsden-purchase.
“The Gadsden Purchase and a Failed Attempt at a Southern Railroad.” National Constitution Center – Constitutioncenter.org, National Constitution Center, constitutioncenter.org/blog/the-gadsden-purchase-and-a-failed-attempt-at-a-southern- railroad.
“The New York Herald. (New York [N.Y.]) 1840-1920, April 06, 1854, MORNING EDITION, Image 4.” News about Chronicling America RSS, William Delmont, chroniclingamerica.loc.gov/lccn/sn83030313/1854-04-06/ed-1/seq- 4/#date1=1853&index=1&rows=20&searchType=advanced&language=&sequence=0&words=Gadsden Treaty treaty&proxdistance=5&date2=1854&ortext=&proxtext=&phrasetext=gadsden treaty&andtext=&dateFilterType=yearRange&page=1.
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