Thomas C. Mann#Mann Doctrine
{{short description|American lawyer and diplomat (1912–1999)}}
{{Other people|Thomas Mann}}
{{Use mdy dates|date=November 2013}}
{{Infobox person
| name = Thomas C. Mann
| image = Thomas C Mann.png
| image size =
| caption =
| birth_name = Thomas Clifton Mann
| birth_date = {{birth date|1912|11|11}}
| birth_place = Laredo, Texas, US
| death_date = {{death date and age|1999|1|23|1912|11|11}}
| death_place = Austin, Texas
| resting_place = Laredo City Cemetery
| alma_mater = Baylor University
| occupation = Diplomat
| awards = 24px President's Award for Distinguished Federal Civilian Service (1966)
| footnotes =
}}
Thomas Clifton Mann (November 11, 1912 – January 23, 1999){{cite web|url=http://ssdi.rootsweb.ancestry.com/cgi-bin/ssdi.cgi?lastname=Mann&firstname=Thomas&start=181|title=Social Security Death Index|publisher=rootsweb.ancestry.com|accessdate=July 21, 2009}} was an American diplomat who specialized in Latin American affairs. He entered the U.S. Department of State in 1942 and quickly rose through the ranks to become an influential establishment figure. He worked to influence the internal affairs of numerous Latin American nations, typically focusing on economic and political influence rather than direct military intervention. After Lyndon B. Johnson became president in 1963, Mann received a double appointment and was recognized as the U.S. authority on Latin America. In March 1964, Mann outlined a policy of supporting regime change and promoting the economic interests of U.S. businesses. This policy, which moved away from the political centrism of Kennedy's Alliance for Progress, has been called the Mann Doctrine. Mann left the State Department in 1966 and became a spokesperson for the Automobile Manufacturer's Association.
Early life
Born in Laredo, an American city on the border with Mexico, Mann grew up speaking English and Spanish. His father was a lawyer and a Southern Baptist.LaFeber, "From the Good Neighbor to Military Intervention" (1993), p. 167.
He attended Baylor University and Baylor Law School, both in Waco, Texas, where he met his wife, the former Nancy Milling Aynesworth. They later had a son, Clifton Aynesworth Mann.{{Cite journal |date=May 1966 |title=Thomas C. Mann Will Leave Department in June |url=https://babel.hathitrust.org/cgi/pt?id=uiug.30112108168821&seq=337 |journal=State Department Newsletter |pages=17 |via=Hathitrust}} Mann graduated from law school in 1934 and took a job at his father's law firm.LaFeber, "From the Good Neighbor to Military Intervention" (1993), p. 168. He held various posts, as a lawyer in Laredo, in 1934 to 1942.
{{Infobox officeholder
| office1 = US Ambassador to El Salvador
| term_start1 = October 11, 1955
| term_end1 = September 24, 1957
| preceded1 = Robert C. Hill
| succeeded1 = Thorsten V. Kalijarvi
| president1 = Dwight D. Eisenhower
| office2 = US Ambassador to Mexico
| term_start2 = April 18, 1961
| term_end2 = December 22, 1963
| preceded2 = Robert C. Hill
| succeeded2 = Fulton Freeman
| president2 = John F. Kennedy
| office3 = 4th Under Secretary of State for Economic Affairs
| term_start3 = March 18, 1965
| term_end3 = May 31, 1966
| preceded3 = George W. Ball
| succeeded3 = William J. Casey
| office4 = 7th and 10th Assistant Secretary of State for Inter-American Affairs
| term_start4 = August 28, 1960
| term_end4 = April 20, 1961
| preceded4 = Roy R. Rubottom Jr.
| succeeded4 = Robert F. Woodward
| term_start5 = January 3, 1964
| term_end5 = March 17, 1965
| preceded5 = Edwin M. Martin
| succeeded5 = Jack Hood Vaughn
| office6 = 5th Assistant Secretary of State for Economic Affairs
| term_start6 = 1957
| term_end6 = 1960
| preceded6 = Thorsten V. Kalijarvi
| succeeded6 = Edwin M. Martin
}}
Early career
Mann was rejected from the Navy due to poor vision. He joined the Diplomatic Service, United States Department Of State in 1942, and was deployed to Montevideo in Uruguay to investigate Nazi shipping. In 1943, he was promoted to do this job across Latin America. He was involved in creating the 1945 Act of Chapultepec treaty for mutual defense of trans-American nations.
Truman administration
After unsuccessfully coordinating US opposition to Juan Perón in the 1946 Argentine election, he directed US diplomats in Latin America to avoid supporting particular candidates in elections—lest they suffer due to the perceived association. He commented during the 1950 Guatemalan election:
At election time it is just political suicide to try to defend the United States... I think on the whole people in the other American Republics understand and support us, but it isn't good politics to say so at election time. We are a sort of punching bag during elections. Everybody likes to take a swing at us, and makes sure he does every time you say something.
Mann sought military assistance from Latin American countries during the Korean War, commenting "that if the Bolivians were complaining about spilling their blood for Yankees, a lot of Yankees were also complaining about American blood already being spilled in Korea for Bolivia and other countries of the hemisphere".LaFeber, "From the Good Neighbor to Military Intervention" (1993), p. 169.
Mann believed that nationalism and Communism were related problems, and sought to prevent both as part of efforts to prevent Latin nationalization of resources.LaFeber, "From the Good Neighbor to Military Intervention" (1993), p. 170. In a surprise to many observers, he agreed to secure US aid for Bolivia following the 1952 Bolivian revolution, partly as a reward for the new government's agreement to compensate US tin companies for nationalized assets.LaFeber, "From the Good Neighbor to Military Intervention" (1993), p. 172. "After six months of careful watching, the United States recognized the new government, then stunned observers by actually giving economic aid, especially through tin purchases. Mann privately explained why aid could be sent to supposed revolutionaries: Bolivia had agreed to compensate former tin owners, especially the relatively few American owners, through arbitration; such arbitration could be an important precedent elsewhere in case of other nationalization; if Washington did not help, it would be charged with 'trying to bring chaos and starvation to Bolivia'; and U.S. bargaining leverage over Bolivia was great because of its purchasing power in the tin markets."
Eisenhower administration
= Policy shift =
In 1952, Mann welcomed the incoming Eisenhower administration with a 42-page memo on US relations with Latin America. {{wikisource|NSC 144/1}} The memo argued that the main issue for the US in this region was not a Communist invasion, but the problem of US control over "readily accessible essential strategic materials". These included vanadium as well as crude petroleum, resources which the US imported mostly from Latin America. Mann advocated swift US intervention to retaliate against nationalizations, as a show of force to deter similar actions by other countries. This memo was a source for NSC 144/1, representing the incoming Eisenhower administration's new policy on Latin America.LaFeber, "From the Good Neighbor to Military Intervention" (1993), pp. 172–174.
= Guatemala =
In Guatemala, Mann attended the inauguration of President Jacobo Árbenz Guzmán and pronounced him a communist. Although he resisted early overtures by United Fruit representatives to intervene, he opposed Árbenz's land reform law, fearing that Guatemala would provide a test case for other nations. After the CIA-backed military coup in 1954, Mann was recalled from Greece to Guatemala. He established Norman Armour as the US ambassador and sought to bolster the new military government of Castillo Armas. Mann reportedly gained de facto veto power over Guatemalan policy; after Mann had rejected a new oil law, Armas said he would come to "no final decision without consulting with Mr. Mann."LaFeber, "From the Good Neighbor to Military Intervention" (1993), pp. 176–177. The final quotation comes from [https://history.state.gov/historicaldocuments/frus1955-57v07/d23 Memorandum of a Conversation Between the Assistant Secretary of State for Inter-American Affairs (Holland) and President Castillo Armas, Guatemala City, February 14, 1955].
Mann later reflected that US operatives in Guatemala had an "illusion of omnipotence", saying in 1975:Brockett, "An Illusion of Omnipotence" (2002), pp. 91, 117.
We were on the crest of a wave and nobody, literally nobody on the Hill or anywhere else ever questioned our ability to do anything if we wanted to do it [and] if we were willing to spend the money and the effort to do it.
= Economic aid =
In late September 1957 Mann moved to Washington, D.C., to become Assistant Secretary of State for Economic Affairs. Trans-American economic problems had created dissatisfaction and threatened to push Latin American countries away from the US. Secretary of State John Foster Dulles blamed an "economic war" waged by Moscow. Vice President Richard Nixon was mobbed by angry protestors in Venezuela and elsewhere.LaFeber, "From the Good Neighbor to Military Intervention" (1993), p. 178. Mann advocated policies of robust economic assistance, establishing the Inter-American Development Bank and promoting low-interest loans financed by the US government. Mann pushed for "a Marshall Plan for Latin America" which would also include private finance. Eisenhower concurred, and appointed Mann as Assistant Secretary of State for Inter-American Affairs in August 1960.LaFeber, "From the Good Neighbor to Military Intervention" (1993), pp. 179–180.
Kennedy administration
President John F. Kennedy promoted the Alliance for Progress, a centrist initiative to support Latin American economies and stave off communism through moderate reform.
Mann did not support the Bay of Pigs invasion, which had been planned by the CIA before Kennedy took office. He doubted the possibility of a popular uprising and, with Kennedy, opposed involvement by the US Air Force. He resigned his position at the State Department just weeks before the invasion took place in April 1961.LaFeber, "From the Good Neighbor to Military Intervention" (1993), p. 184.Irving Molotsky, "[https://www.nytimes.com/1999/01/30/world/t-c-mann-87-a-maker-of-us-latin-policy.html T. C. Mann, 87, a Maker of U.S. Latin Policy]", New York Times, January 30, 1999. In general, Mann felt that military action against Cuba would be too damaging for the US image.Pérez, "Fear and Loathing of Fidel Castro" (2002), pp. 236. "Considerable attention was given to the repercussions of unilateral action against Cuba in Latin America. Assistant Secretary of State Thomas Mann was not alone in his early opposition to unilateral US efforts to remove Fidel Castro. '[I]f we were to go all out to get Castro,' Mann cautioned, 'it would obviously be what we would do. What would the effect be in the other Latin American countries? [W]e have to maintain a steady pressure and keep our motives well disguised in this business.' " Instead, he supported economic sanctions to create suffering and dissatisfaction among the Cuban poor.Pérez, "Fear and Loathing of Fidel Castro" (2002), p. 241. "Thomas Mann agreed, predicting that sanctions would 'exert a serious pressure on the Cuban economy and contribute to the growing dissatisfaction and unrest in the country'."
Kennedy appointed Mann United States Ambassador to Mexico where he successfully negotiated a settlement of the Chamizal border between the US and Mexican governments, caused by a shift in the Rio Grande.
Johnson administration
On December 14, 1963, new President Lyndon B. Johnson re-appointed Mann Assistant Secretary of State for Inter-American Affairs. On December 21, Johnson also made Mann the head of the US Agency for International Development (USAID), an organization created by President Kennedy two years earlier. The double-appointment was opposed by the Kennedys and their liberal supporters, including Senator Hubert Humphrey and advisor Arthur Schlesinger Jr. Schlesinger wrote that Johnson's appointment of Mann constituted "a declaration of independence, even perhaps a declaration of aggression against the Kennedys."Stephen G. Rabe, The Most Dangerous Area in the World: John F. Kennedy Confronts Communist Revolution in Latin America; University of North Carolina Press, 1999; p. [https://books.google.com/books?id=ep84pGoEh0MC&pg=PA173 173]. Members of the United States corporate establishment, generally felt they had a good relationship with Mann and supported the appointment.LaFeber, "From the Good Neighbor to Military Intervention" (1993), p. 186. "The Kennedys and their supporters were stunned and bitter. Key liberals such as Senator Hubert Humphrey (D.-Minn.) tried to prevent the appointments. LBJ paid no attention. U.S. corporations operating in Latin America were delighted. 'The news of Tom Mann's appointment created more favorable reaction in Latin America than the launching of President Roosevelt's Good Neighbor policy,' cabled the vice president for Brown and Root Overseas, Inc., a powerful Texas firm with close ties to Johnson. 'I know him well and consider him the greatest.' Some liberals, including Senator Ernest Gruening (D.-Alaska) applauded the appointments in the hope that Mann could finally make Latin American policy work."Walker, "Mixing the Sweet with the Sour" (1994), p. 60.
= Mann Doctrine =
{{See also|Johnson Doctrine}}
In March 1964, the new Johnson administration held a three-day policy conference for all U.S. diplomats in Latin America. On March 18, Mann gave a secret speech to U.S. officials which laid out the administration's policy for the region. Mann did not discuss the Alliance for Progress. His policy called for non-intervention against dictators if they were friendly to US business interests, but intervention against Communists regardless of their policies. The content of Mann's speech was leaked to the New York Times. His comments were interpreted as prioritizing US economic interests over political reform, and the thrust of this policy became known as the "Mann Doctrine".LaFeber, "From the Good Neighbor to Military Intervention" (1993), pp. 187–188.Muller, "Dependent Economic Development" (1985), pp. 448–449.
= Brazil =
Later that month, Mann supported the military overthrow of the democratically elected government in Brazil, claiming a victory against Communism. Mann assisted this takeover directly by diverting US aid to Brazil away from the Goulart's central government.LaFeber, "From the Good Neighbor to Military Intervention" (1993), pp. 190–191.Walker, "Mixing the Sweet with the Sour" (1994), p. 62. "While plans were underway to condemn Cuba for subversive activities, Secretary Mann announced the doctrine that bears his name. The United States would not inquire into the nature of regimes that were to receive military and economic assistance, an evaluation that several officials in the Kennedy administration had advocated. Support for social reforms had ceased to be a sine qua non for gaining Washington's favor." US operatives interpreted the March 18 Mann Doctrine as a "green light" for the coup to go forward.Muller, "Dependent Economic Development" (1985), p. 449. "A minority faction within the Army (estimated by one anti-Goulart general to have consisted in early March of about 10 percent of the higher officer corps-see Stepan, 1978: 122), which had favored a coup against Goulart since the beginning of his administration because of his alleged Communist tendencies, now decided to take the offensive. They were encouraged by American policymakers at the highest level in Washington, who gave an obvious and unequivocal 'green light' signal in announcing (but not for public consumption) the 'Mann Doctrine' on March 18,' and by the American Embassy in Brazil, which offered war material in case the coup should lead to civil war." After the coup, Mann stated that "the frustration of Communistic objectives in Brazil was the single most important victory for freedom in the hemisphere in recent years".{{cite book|last1=Rabe|first1=Stephen G.|author-link=Stephen G. Rabe|title=The Most Dangerous Area in the World: John F. Kennedy Confronts Communist Revolution in Latin America|date=1999|publisher=University of North Carolina press|location=Chapel Hill|isbn=080784764X|page=[https://books.google.com/books?id=hVhuAwAAQBAJ&pg=PA71 71]}}
= Chile =
In Chile, Mann ordered an intensive and coordinated campaign in favor of Eduardo Frei against Salvador Allende in the 1964 elections. In a May 1 memo to Secretary of State Dean Rusk, Mann wrote:[https://history.state.gov/historicaldocuments/frus1964-68v31/d253 253. Memorandum From the Assistant Secretary of State for Inter-American Affairs (Mann) to Secretary of State Rusk], Foreign Relations of the United States 1964–1968, Volume XXXI: "South and Central America; Mexico", Document 253. Cited in Power, "Engendering of Anticommunism and Fear" (2008), p. 934.
Clearly, the September election will be determined by factors which are deeply rooted in the political, economic, and social fabric of the Chilean scene and by the campaign abilities of the major contenders. Given the consequences, however, if this major Latin American nation should become the first country in the hemisphere to freely choose an avowed Marxist as its elected president, the Department, CIA, and other agencies have embarked on a major campaign to prevent Allende's election and to support Frei, the only candidate who has a chance of beating him.
Mann described a ten-point plan, which included:Power, "Engendering of Anticommunism and Fear" (2008), pp. 934–935.
- threats of economic retaliation against Chile if Allende won;
- CIA and USIA production and dissemination of unattributed propaganda against Allende;
- $70 million in emergency loans to prop up the economy and reduce unemployment before the election; and
- secret contacts of US government and businesses with Chilean business, military, police, clergy, trade unions, and Masons, for the purpose of opposing Allende.
These efforts were successful in 1964 but reversed in 1970.LaFeber, "From the Good Neighbor to Military Intervention" (1993), p. 190. "During the 1964 Chilean elections, Mann paid little attention either to that principle or to his lesson, learned during the Argentine election of 1946, that U.S. interference in foreign political campaigns usually backfired. Eduardo Frei, a moderate reformer, ran against Salvador Allende, suspected of Marxist leanings and, as Mann phrased it, 'extremist supporters'. The U.S. economic stake was huge, especially in industry and in copper mines that Washington feared Allende might nationalize if he won. Mann ordered complete support of Frei, threatened economic retaliation of Allende triumphed, and wanted 'no doubt in Chile as to where the United States stands.' Frei won, but the Allende problem was only delayed for six years."
= Bolivia =
In Bolivia, when General René Barrientos Ortuño led a takeover of the popular Revolutionary Nationalist Movement (MNR) government, which had been in power for twelve years, Mann secured aid for the new military government.LaFeber, "From the Good Neighbor to Military Intervention" (1993), p. 191. "The generals' success and the Mann doctrine were also played out in Bolivia and Argentina. In Bolivia, Mann (and key U.S. congressional leaders) became critical of, and began distancing the United States from, Paz Estensaro's formerly revolutionary MNR party. When the military seized power in 1964, opened the door to foreign investment, promised agrarian reforms, and smashed urban labor demands, Mann responded with aid."
= Panama =
Mann later served in Panama during a period of intense agitation waged by Panamanians against the Panama Canal Zone. Mann began some successful negotiations with Panama, but was undercut by Johnson, who did not want to capitulate for political reasons.LaFeber, "From the Good Neighbor to Military Intervention" (1993), p. 192.
= Dominican Republic =
In the Dominican Republic, Mann labeled democratically elected President Juan Bosch a communist and supported the US invasion in 1965. In April 1965, Mann personally insisted on the production of a cable which would describe danger to American citizens in the Dominican Republic. At the same time, Mann pressured the military government to crack down on insurgents in Santo Domingo. Mann described the popular rebellion as Communist infiltration enabled by Castro and supported the U.S. invasion as a necessary response.LaFeber, "From the Good Neighbor to Military Intervention" (1993), pp. 193–194.
= Promotion and resignation =
Mann became the Undersecretary of State for Economic Affairs in 1965. He was bestowed the President's Award for Distinguished Federal Civilian Service by President Johnson in 1966. This is the highest award that can be given to a career civilian employee of the federal government. Mann was cited as having "represented the United States with outstanding judgment, initiative, intelligence, and vision."{{Cite journal |date=June 1966 |title=Tom Mann Receives President's Award |url=https://babel.hathitrust.org/cgi/pt?id=uiug.30112108168821&seq=415 |journal=State Department |pages=19 |via=Hathitrust}} He resigned from the State Department in June of 1966 and served as president of the Automobile Manufacturer's Association from 1967 through 1971.John Henrichs, "Ex-U.S. Ambassador Thomas C. Mann dies", Austin-American Statesman, January 24, 1999. {{ProQuest|255629167}}
Personal life
Image:T.C. Mann grave marker IMG 3206.JPG
Mann was a brother of the late Laredo attorney Samuel Edward "Ed" Mann, a 1923 graduate of the University of Texas Law School and an inductee into the prestigious legal honor society, Crossroads.{{cite web|url=http://www.utexas.edu/law/academics/chancellors/archive.html|title=The University of Texas School of Law (Graduates, 1912–1969)|publisher=utexad.edu|accessdate=July 21, 2009}} He died on January 23, 1999, in Lubbock, Texas.
Mann Road in Laredo is named for the Mann family. Thomas Mann is interred at Laredo City Cemetery.
{{Clear}}
References
{{Reflist|30em}}
= Bibliography =
- Brockett, Charles D. [http://smsisaac.yolasite.com/resources/guatemala%20brockett.pdf An Illusion of Omnipotence: U.S. Policy toward Guatemala, 1954–1960]. Latin American Politics and Society 44(1), Spring 2002.
- LaFeber, Walter. "Thomas C. Mann and the Devolution of Latin American Policy: From the Good Neighbor to Military Intervention". In Behind the Throne: Servants of Power to Imperial Presidents, 1898–1968, ed. Thomas J. McCormick & Walter LaFeber. University of Wisconsin Press, 1993. {{ISBN|0-299-13740-6}}
- Muller, Edward N. "Dependent Economic Development, Aid Dependence on the United States, and Democratic Breakdown in the Third World". International Studies Quarterly 29(4), December 1985. {{jstor|2600381}}, October 10, 2013.
- Pérez Jr., Louis A. "[https://web.archive.org/web/20150610211122/http://www.colorado.edu/geography/courses/geog_3812_f03/perez.pdf Fear and Loathing of Fidel Castro: Sources of US Policy toward Cuba]". Journal of Latin American Studies 34(2), May 2002. Accessed
- Power, Margaret. "[https://www.academia.edu/1092231/The_Engendering_of_Anti-Communism_and_Fear_in_Chiles_1964_Presidential_Election The Engendering of Anticommunism and Fear in Chile's 1964 Presidential Election]". Diplomatic History 32(5), November 2008.
- Walker III, William O. "Mixing the Sweet with the Sour: Kennedy, Johnson, and Latin America". In The Diplomacy of the Crucial Decade: American Foreign Relations During the 1960s, ed Diane B. Kunz. New York: Columbia University Press, 1994. {{ISBN|0-231-08177-4}}
External links
- [http://eisenhower.archives.gov/Research/Finding_Aids/M.html Papers of Thomas C. Mann, Dwight D. Eisenhower Presidential Library]
- {{webarchive |url=http://webarchive.loc.gov/all/20011126070230/http://www.lbjlib.utexas.edu/johnson/archives.hom/oralhistory.hom/mann-t/mann-t.asp |title=Oral History Interview with Thomas C. Mann, from the Lyndon Baines Johnson Library |date=2001-11-26}}
- [https://history.state.gov/departmenthistory/people/mann-thomas-clifton List of official positions], State Department Office of the Historian
= Newspaper articles =
- "[https://news.google.com/newspapers?id=1nseAAAAIBAJ&sjid=-ckEAAAAIBAJ&pg=2390,2059492&hl=en Reds' Work in Cuba Outlined: State Dept. Aide Says Technicians Imported]", Daytona Beach Morning Journal,
- "[https://news.google.com/newspapers?id=evAcAAAAIBAJ&sjid=mWUEAAAAIBAJ&pg=5385,5715263&hl=en Latin-American Ties Jolted]", Sarasota Herald-Tribune, March 20, 1964.
- "[https://news.google.com/newspapers?id=Wf0eAAAAIBAJ&sjid=8YsEAAAAIBAJ&pg=6511,35386&hl=en Castro End Well Begun]", William S. White, Sarasota Journal, August 1, 1964.
- "[https://news.google.com/newspapers?id=x0BIAAAAIBAJ&sjid=CwENAAAAIBAJ&pg=755,1323820&hl=en Pan-American Squeeze Is Hurting Fidel Castro]", William S. White, Morning Record, September 14, 1964.
- "[https://news.google.com/newspapers?id=dVJTAAAAIBAJ&sjid=B30DAAAAIBAJ&pg=4080,515540&hl=en U.S. Offering Countries Population Problems Aid]", St. Petersburg Times, November 12, 1964.
- "[https://news.google.com/newspapers?id=58tIAAAAIBAJ&sjid=FgINAAAAIBAJ&pg=5701,4318507&hl=en Mann to Replace Harriman in State Department Shakeup]", Meriden Journal, February 12, 1965.
- "[https://news.google.com/newspapers?id=sm9YAAAAIBAJ&sjid=2_cDAAAAIBAJ&pg=4122,1921846&hl=en Latin Policy Protest Halts Senate Vote]", Spokane Daily Chronicle, February 8, 1966
- "[https://news.google.com/newspapers?id=O69IAAAAIBAJ&sjid=rAENAAAAIBAJ&pg=1164,973304&hl=en Automakers Sued Over Air Pollution]", Meriden Journal, January 11, 1969.
{{s-start}}
{{s-dip}}
{{succession box
| before=Robert C. Hill
| title=United States Ambassador to El Salvador
| years=November 24, 1955 – September 24, 1957
| after=Thorsten V. Kalijarvi
}}
{{succession box |title=U.S. Ambassador to Mexico | before=Robert C. Hill | after=Fulton Freeman | years=May 8, 1961 – December 22, 1963}}
{{s-gov}}
{{succession box|
before=Thorsten Valentine Kalijarvi|
title=Assistant Secretary of State for Economic Affairs|
after=Edwin McCammon Martin|
years=September 30, 1957 – August 28, 1960
}}
{{succession box|
before=Roy R. Rubottom Jr.|
title=Assistant Secretary of State for Inter-American Affairs|
after=Robert F. Woodward|
years=August 28, 1960 – April 20, 1961
}}
{{succession box|
before=Edwin M. Martin|
title=Assistant Secretary of State for Inter-American Affairs|
after=Jack Vaughn|
years=January 3, 1964 – March 17, 1965
}}
{{succession box|
before=George Wildman Ball|
title=Under Secretary of State for Economic Affairs|
after=William J. Casey|
years=March 18, 1965 – May 31, 1966
}}
{{s-end}}
{{US Ambassadors to Mexico}}
{{Authority control}}
{{DEFAULTSORT:Mann, Thomas C.}}
Category:People from Laredo, Texas
Category:Baylor University alumni
Category:People from Lubbock, Texas
Category:United States assistant secretaries of state
Category:Ambassadors of the United States to Mexico
Category:Ambassadors of the United States to El Salvador
Category:20th-century American lawyers
Category:Recipients of the President's Award for Distinguished Federal Civilian Service