Why was the Bill of Rights added to the U.S. Constitution?

The Bill of Rights was added to the U.S. Constitution primarily to address widespread concerns regarding the power of the new federal government. During the ratification process of 1787–1788, many citizens and politicians—known as Anti-Federalists—feared that the original Constitution lacked sufficient protections for individual liberties and provided inadequate checks against central authority.123

Because ratification in several key states was contingent upon the promise that a bill of rights would be added, the first Congress of the United States moved to satisfy these demands. James Madison drafted the amendments, drawing inspiration from the Magna Carta, the English Bill of Rights, and the Virginia Declaration of Rights.435

These ten amendments, ratified in 1791, were designed to limit the power of the federal government and provide explicit guarantees of individual liberty, such as freedom of speech, religion, and the press, as well as protections for those accused of crimes.643