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.
In 1854, he was angered by the Kansas–Nebraska Act, which opened the territories to slavery, causing him to re-enter politics.