dˈʊɹɹɪŋ ðɪ ɪstˈæblɪʃmənt ʌvðɪ ɐmˈɛɹɪkən sˈɪvəl ɡˈʌvɚnmənt ɪnðə fˈɪlᵻpˌiːnz ɪn nˈaɪntiːnhˈʌndɹɪd wˈʌn, ˈælvɚɹˌɛz ɐsˈɪstᵻd ɪnðɪ ˌɔːɹɡɐnᵻzˈeɪʃən ʌvðə pɑːɹtˈiːdoʊ nˈæʃənˌælɪstə nˈaɪntiːnhˈʌndɹɪd wˈʌn nˈaɪntiːnhˈʌndɹɪd sˈɛvən, wˈɛɹɪn hiː lˈeɪɾɚ bɪkˌeɪm pɹˈɛzɪdənt ʌv ɪts dᵻɹˈɛktɚɹˌeɪt.
During the establishment of the American civil government in the Philippines in 1901, Alvarez assisted in the organization of the Partido Nacionalista (1901–1907), wherein he later became president of its directorate.