What did the passage of the Kansas-Nebraska Act the Supreme Court's Dred Scott decision and John Brown's raid on Harpers Ferry have in common?

The Kansas-Nebraska Act, the Supreme Court's Dred Scott decision, and John Brown's raid on Harpers Ferry all significantly contributed to escalating tensions over slavery in the United States. Each event highlighted the deep divisions between pro-slavery and anti-slavery factions, with the Act allowing for popular sovereignty, the Dred Scott decision denying African Americans any legal standing, and Brown's raid symbolizing militant abolitionism. Together, they intensified the national debate on slavery and set the stage for the Civil War.