Final answer:
Founders in favor of natural rights supported the Bill of Rights to limit government power and ensure individual freedoms were protected. It was added after the Constitution's ratification to address Anti-Federalists' fears of government overreach.
Step-by-step explanation:
Founders who supported natural rights advocated for the addition of the Bill of Rights to the Constitution primarily because they sought to limit the power of the government. The Bill of Rights consists of the first ten amendments to the Constitution and outlines many of the personal rights that state constitutions already guaranteed. Some of the founders believed in key principles such as those outlined by John Locke, like life, liberty, and property, and the ideas of Baron Montesquieu regarding the separation of powers. Yet, the reason for adding a bill of rights was the fear among Anti-Federalists and others that the federal government, as established by the new Constitution, might infringe upon the rights and freedoms of individuals.
Anti-Federalists were particularly concerned with the lack of protections against governmental overreach and demanded that a Bill of Rights be included to protect individual liberties. Several states made the passage of a Bill of Rights a condition of their acceptance of the Constitution. Ultimately, this culminated in the adoption of the Bill of Rights in 1791, which quelled the apprehension surrounding the establishment of a strong federal government and legitimized it among those wary of centralized power.