The correct answer is the Bill of Rights. These are the first 10 amendments to the United States constitution that were mad to ensure the existence of human rights that were not specifically mentioned in the constitution when it was first made and ratified.
Answer:
Though the Missouri Compromise managed to keep the peace—for the moment—it failed to resolve the pressing question of slavery and its place in the nation's future. ... Passage of the Kansas-Nebraska Act sparked violence between pro- and anti-slavery settlers in “Bleeding Kansas,” delaying Kansas' admission to the Union.17
Ancient times I believe is the answer you are looking for. Hope this helps you out! : )