ɪn wˈʌn θˈaʊzənd ˈeɪthˈʌndɹɪd sˈɛvənti tˈuː, θˈoːɹnbɜːɡ wʌz ɐpˈɔɪntᵻd juːnˈaɪɾᵻd stˈeɪts kəmˈɪʃənɚɹ æt ðɪ ˌɪntɚnˈæʃənəl ɛkspəzˈɪʃən hˈɛld ɪn vɪˈɛnə, ˈɔːstɹiə.
In 1872, Thornburgh was appointed United States commissioner at the International Exposition held in Vienna, Austria.