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embassy.org: Yesterday's Trivia Question of the Day

Who were the first U.S. Ambassadors?

The answer is:

The rank of Ambassador was first used by the United States in 1893. Thomas F. Bayard was appointed Ambassador to Great Britain on March 30. James B. Eustis was appointed Ambassador to France on April l8. Prior to this date, the highest-ranking U.S. diplomats were Ministers. [source: U.S. State Department]