who was the author of the bill of rights?
On September 25, 1789, Congress transmitted to the state Legislatures twelve proposed amendments to the Constitution. Numbers three through twelve were adopted by the states to become the United States (U.S.) Bill of Rights, effective December 15, 1791. James Madison proposed the U.S. Bill of Rights. On September 25, 1789, Congress transmitted to the state Legislatures twelve proposed amendments to the Constitution. Numbers three through twelve were adopted by the states to become the United States (U.S.) Bill of Rights, effective December 15, 1791. James Madison proposed the U.S. Bill of Rights. It largely responded to the Constitution's influential opponents, including prominent Founding Fathers, who argued that the Constitution should not be ratified because it failed to protect the basic principles of human liberty.