In 1863, he issued the Emancipation Proclamation, which declared the slaves in the states "in rebellion" to be free.
ɪn wˈʌn θˈaʊzənd ˈeɪthˈʌndɹɪd sˈɪksti θɹˈiː, hiː ˈɪʃuːd ðɪ ɪmˌænsɪpˈeɪʃən pɹˌɑːklɐmˈeɪʃən, wˌɪtʃ dᵻklˈɛɹd ðə slˈeɪvz ɪnðə stˈeɪts "ɪn ɹᵻbˈɛliən" təbi fɹˈiː.