Which statement best explains how the kansas-nebraska act contributed to the tensions between the north and the south that led to the civil war ? . a- the act gave abolitionist leaders enough seats in congress to outlaw slavery throughout the united states.. b-the act allowed state governments to prevent fugitive slaves from being returned to their owners in the south.. c-the act led to violent conflicts between settlers in the great plains over the issue of expanding slavery to new territories.. d-the act prevented southern slave owners from taking their slaves into federal territories without