How did the Kansas-Nebraska Act and the concept of popular sovereignty affect these important American territories? A. By violating the Missouri Compromise, the act incited violence and rioting throughout the territories and their bordering states. B. By prohibiting the spread of slavery into either territory, the act sparked rioting among slavery supporters in cities throughout the territories. C. It allowed for the spread of slavery into both territories, but few of the people who lived there were wealthy enough to buy and own slaves, so despite some angry demonstrations, the act had little impact D. By allowing Kansas and Nebraska to vote on allowing slavery, the act spurred both supporters and opponents of slavery to move to both territories to sway the decision, and this resulted in deadly violence. .