Who is William Seward addressing in his Irrepressible Conflict speech about abolishing slavery?

In his "Irrepressible Conflict" speech, William Seward addresses both the American public and political leaders of his time, urging them to confront the issue of slavery head-on. He argues that the conflict between freedom and slavery is fundamental and cannot be avoided. Seward aims to rally support for the abolitionist cause, emphasizing the moral imperative to end slavery and the inevitability of conflict if the issue remains unresolved.