ðə mədʒˈɔːɹᵻɾi ʌvðɪ ɐmˈɛɹɪkən nˈæʃənəl tʃˈæmpiənʃˌɪp ɹˈeɪsᵻz wɜː kəntˈɛstᵻd æt sˈʌtʃ vˈɛnjuːz dˈʊɹɹɪŋ ðə nˈaɪntiːnhˈʌndɹɪd twˈɛnti z.
The majority of the American national championship races were contested at such venues during the 1920s.