The Kansas-Nebraska Act
An Act to Organize the Territories of Nebraska and Kansas May 30, 1854
The Kansas-Nebraska Act allowed for new territories to decide if they were a free or slave state by popular sovereignty. The Kansas-Nebraska Act undid the compromise that was made in the Missouri Compromise, which designated a line of latitude to be the separation of free and slave states. The Kansas-Nebraska act reignited the disagreement between pro and anti slavery factions. Fighting and violent events would become so terrible that it was termed, Bleeding Kansas.
https://www.battlefields.org/learn/primary-sources/kansas-nebraska-act
