Over the course of his life, James Madison changed the United States three times: First, he designed the Constitution, led the struggle for its adoption and ratification, then drafted the Bill of Rights. As an older, cannier politician he co-founded the original Republican party, setting the course of American political partisanship. Finally, having pioneered a foreign policy based on economic sanctions, he took the United States into a high-risk conflict, becoming the first wartime president and, despite the odds, winning.

Now Noah Feldman offers an intriguing portrait of this elusive genius and the constitutional republic he created―and how both evolved to meet unforeseen challenges. Madison hoped to eradicate partisanship yet found himself giving voice to, and institutionalizing, the political divide. Madison’s lifelong loyalty to Thomas Jefferson led to an irrevocable break with George Washington, hero of the American Revolution. Madison closely collaborated with Alexander Hamilton on the Federalist papers―yet their different visions for the United States left them enemies.