James Madison is known as the "father of the Constitution" in the United States. He played a pivotal role in the drafting and promoting of the U.S. Constitution and the Bill of Rights during the Constitutional Convention of 1787. His extensive notes captured the debates and ideas that shaped the document. Madison also contributed to the Federalist Papers alongside Alexander Hamilton and John Jay, which advocated for the Constitution's ratification. His vision of a strong federal government balanced by individual liberties has had a lasting impact on American governance and constitutional law.