How did the kansas and nebraska act led to the civil war?

The Kansas-Nebraska Act of 1854 allowed settlers in those territories to decide whether to allow slavery through popular sovereignty, effectively repealing the Missouri Compromise. This led to violent conflicts known as "Bleeding Kansas" as pro-slavery and anti-slavery factions clashed over control. The act heightened tensions between the North and South, galvanizing abolitionist movements and polarizing political parties, which contributed significantly to the outbreak of the Civil War.