A month later, Joseph Albert Walker became the first American civilian in space when his X-15 Flight 90 crossed the  line, qualifying him by the international definition of spaceflight.
ɐ mˈʌnθ lˈeɪɾɚ, dʒˈoʊsəf ˈælbɚt wˈɔːkɚ bɪkˌeɪm ðə fˈɜːst ɐmˈɛɹɪkən sɪvˈɪliən ɪn spˈeɪs wɛn hɪz ˈɛks fˈɪftiːn flˈaɪt nˈaɪnti kɹˈɔst ðə lˈaɪn, kwˈɔlᵻfˌaɪɪŋ hˌɪm baɪ ðɪ ˌɪntɚnˈæʃənəl dˌɛfɪnˈɪʃən ʌv spˈeɪsflaɪt.