The American leader known for his role in drafting the Constitution of the United States is James Madison. Often referred to as the "Father of the Constitution," Madison played a vital role in the 1787 Constitutional Convention, advocating for a strong national government while balancing the interests of states. He was instrumental in drafting the document and promoting its ratification through the Federalist Papers, co-authoring with Alexander Hamilton and John Jay. Madison's political philosophy and vision for governance significantly shaped the foundational principles of American democracy and the Bill of Rights.