This question tests knowledge of historical inventions and their inventors, focusing on significant technological advancements. B. The Act did not permit the territories the right to vote over the question of slavery. C. The voice of the majority in regard to the issue of slavery was muzzled. D. The Federal Government had the sole authority to decide on slavery. Ans: A - The Kansas-Nebraska Act repealed the Missouri Compromise of 1820. - It introduced the principle of popular sovereignty, allowing residents of the territories to decide on slavery.