The "Federalist Papers," a collection of 85 essays written by Alexander Hamilton, James Madison, and John Jay, was created to promote the ratification of the U.S. Constitution in 1787-1788. These essays argued for the principles of the Constitution and addressed concerns raised by opponents about the new government structure. They outlined the importance of a strong federal government to prevent tyranny and protect individual liberties while explaining checks and balances. The Federalist Papers remain a crucial resource for understanding the intentions behind the Constitution and the foundation of American political philosophy.