Tuhia he whakamāramatanga mō tēnei wāhanga - Ko te pukapuka tuatahi a Cole, "The Whig Party in the South", i riro i a ia te Tohu Justin Winsor o te American Historical Association i te tau 1912. Ko te korero a Cole e pa ana ki te Whare o Lincoln i wehewehea
i whakaputaina e te Whare Wānanga o Chicago Press i te tau 1923. Ko tana pukapuka tuatoru, ko "Irrepressible Conflict, 1850-65", he hitori hapori, ohanga, me te ahurea o te Pakanga Tangata, a i whakaputaina e Macmillan Publishers i te 1934.