What was James Buchanan unfinished business?

James Buchanan's "unfinished business" primarily refers to his failure to address the escalating tensions over slavery and the secession of Southern states leading up to the Civil War. His administration struggled to find a compromise that could unify the nation, and his inaction on critical issues, such as the Dred Scott decision and the tensions surrounding Kansas-Nebraska Act, left the country divided. Ultimately, Buchanan's presidency is often criticized for lacking decisive leadership during a pivotal moment in American history. This failure contributed to the onset of the Civil War shortly after he left office.