Diggins notes, "Lincoln presented Americans a theory of history that offers a profound contribution to the theory and destiny of republicanism itself" in the 1860 Cooper Union speech.
dˈɪɡɪnz nˈoʊts, "lˈɪŋkən pɹɪzˈɛntᵻd ɐmˈɛɹɪkənz ɐ θˈiəɹi ʌv hˈɪstɚɹi ðæt ˈɔfɚz ɐ pɹəfˈaʊnd kˌɑːntɹɪbjˈuːʃən tə ðə θˈiəɹi ænd dˈɛstɪni ʌv ɹᵻpˈʌblɪkənˌɪzəm ɪtsˈɛlf" ɪnðə wˈʌn θˈaʊzənd ˈeɪthˈʌndɹɪd sˈɪksti kˈuːpɚ jˈuːniən spˈiːtʃ.