Kansas-Nebraska Act: This legislation allowed people in Kansas and Nebraska territories to decide whether they wanted to allow slavery or not through popular sovereignty.
Bleeding Kansas: Refers to the period of violence and conflict that occurred as a result of conflicting pro-slavery and anti-slavery settlers rushing into Kansas after the passage of the Kansas-Nebraska Act.
Dred Scott Decision: A Supreme Court decision that ruled slaves were property and not citizens, intensifying sectional tensions and contributing to violent conflicts between abolitionists and pro-slavery advocates.