The Federalist Papers are a collection of 85 articles and essays written in 1787 and 1788 to promote the ratification of the United States Constitution. Authored primarily by Alexander Hamilton, James Madison, and John Jay, these writings explain the principles of the new government and address concerns about its structure and powers. The essays were published in various newspapers and aimed to persuade the public and state legislatures of the benefits of a strong federal government. They cover topics such as the separation of powers, checks and balances, and the importance of a unified nation, laying the groundwork for American political philosophy.