In 1854, he was angered by the Kansas–Nebraska Act, which opened the territories to slavery, causing him to re-enter politics.
ɪn wˈʌn θˈaʊzənd ˈeɪthˈʌndɹɪd fˈɪfti fˈoːɹ, hiː wʌz ˈæŋɡɚd baɪ ðə kˈænzəs nəbɹˈæskə ˈækt, wˌɪtʃ ˈoʊpənd ðə tˈɛɹɪtˌoːɹiz tə slˈeɪvɚɹi, kˈɔːzɪŋ hˌɪm tə ɹˌiːˈɛntɚ pˈɑːlətˌɪks.