Final answer:
The Bill of Rights was added to the U.S. Constitution to address Anti-Federalist concerns and ensure individual liberties, safeguarding against potential government overreach and abuses that had occurred under British rule.
Step-by-step explanation:
The Framers of the United States Constitution integrated the grievances addressed by the Bill of Rights largely in response to the Anti-Federalists' fears that the new federal government might infringe upon individual liberties. The Constitution, as originally drafted in 1787, lacked specific guarantees of civil liberties, but after intense debate during the ratification process, a promise was made to add a series of amendments to protect such rights. These first ten amendments, known as the Bill of Rights, were ratified in 1791 to ensure protections such as freedom of speech, the press, and religion; the right to bear arms; protections against unreasonable searches and seizures; and the right to a fair trial, among others. These amendments were designed to prevent abuses like those under British rule, exemplified by the Alien and Sedition Acts of 1798, and to secure the ratification of the Constitution by ensuring individual liberties were adequately safeguarded.