What events of Buchanan's presidency further divided the nation?

During James Buchanan's presidency, several key events exacerbated national divisions, most notably the Dred Scott decision in 1857, which denied citizenship to African Americans and heightened tensions over slavery. Additionally, the violent confrontations in "Bleeding Kansas," resulting from the Kansas-Nebraska Act and the struggle between pro-slavery and anti-slavery settlers, further inflamed regional animosities. Buchanan's reluctance to take a strong stance on these issues and his support for pro-slavery factions alienated many in the North, ultimately deepening the divide that would lead to the Civil War.