| 1 | A | B | C | D |
| --- | --- | --- | --- | --- |
| 2 | List of ambassadors of the United States to Mexico - List of ambassadors |  |  |  |
| 3 | Ambassador | Presentation | Termination | Appointed by |
| 4 | Powell Clayton | January 3, 1899 | May 26, 1905 | William McKinley |
| 5 | Edwin H. Conger | June 15, 1905 | August 3, 1905 | Theodore Roosevelt |
| 6 | David Eugene Thompson | March 8, 1906 | December 1, 1909 | Theodore Roosevelt |
| 7 | Henry Lane Wilson | March 5, 1910 | February 18, 1913 | William Howard Taft |
| 8 | Henry P. Fletcher | March 3, 1917 | January 25, 1919 | Woodrow Wilson |
| 9 | Charles B. Warren | March 31, 1924 | July 22, 1924 | Calvin Coolidge |
| 10 | James R. Sheffield | October 15, 1924 | June 5, 1927 | Calvin Coolidge |
| 11 | Dwight Morrow | October 29, 1927 | September 17, 1930 | Calvin Coolidge |
| 12 | J. Reuben Clark | November 28, 1930 | February 14, 1933 | Herbert Hoover |
| 13 | Josephus Daniels | April 24, 1933 | November 9, 1941 | Franklin D. Roosevelt |
| 14 | George S. Messersmith | February 24, 1942 | May 15, 1946 | Franklin D. Roosevelt |
| 15 | Walter C. Thurston | June 17, 1946 | November 4, 1950 | Harry S. Truman |
| 16 | William O'Dwyer | November 23, 1950 | December 6, 1952 | Harry S. Truman |
| 17 | Francis White | April 28, 1953 | June 30, 1957 | Dwight D. Eisenhower |
| 18 | Robert C. Hill | July 25, 1957 | December 1, 1960 | Dwight D. Eisenhower |
| 19 | Thomas C. Mann | May 8, 1961 | December 22, 1963 | John F. Kennedy |
| 20 | Fulton Freeman | April 6, 1964 | January 6, 1969 | Lyndon B. Johnson |
| 21 | Robert H. McBride | July 22, 1969 | January 25, 1974 | Richard Nixon |
| 22 | Joseph J. Jova | January 30, 1974 | February 21, 1977 | Richard Nixon |
| 23 | Patrick Joseph Lucey | July 19, 1977 | October 31, 1979 | Jimmy Carter |
| 24 | Julian Nava | May 7, 1980 | April 3, 1981 | Jimmy Carter |
| 25 | John Gavin | June 5, 1981 | June 10, 1986 | Ronald Reagan |
| 26 | Charles J. Pilliod Jr. | November 4, 1986 | April 7, 1989 | Ronald Reagan |
| 27 | John Negroponte | July 3, 1989 | September 5, 1993 | George H. W. Bush |
| 28 | James R. Jones | September 10, 1993 | June 25, 1997 | Bill Clinton |
| 29 | Jeffrey Davidow | August 5, 1998 | September 14, 2002 | Bill Clinton |
| 30 | Tony Garza | November 22, 2002 | January 20, 2009 | George W. Bush |
| 31 | Carlos Pascual | August 9, 2009 | March 19, 2011 | Barack Obama |
| 32 | Earl Anthony Wayne | August 2, 2011 | July 31, 2015 | Barack Obama |
| 33 | Roberta S. Jacobson | June 20, 2016 | May 5, 2018 | Barack Obama |
| 34 | William H. Duncan | 2018 | - | Donald Trump |

Question: Who did Truman appoint as US Ambassador to Mexico in 1950 and how long did they serve in that role?
Answer: Harry Truman appointed William O'Dwyer as U.S. Ambassador to Mexico in 1950, who served until 1952.