The Federalist Papers are a collection of 85 essays written between October 1787 and August 1788 advocating ratification of the United States Constitution. They were published serially in New York newspapers under the shared pseudonym “Publius” and were later compiled into book form. The essays were written by Alexander Hamilton, James Madison, and John Jay, though the specific authorship of several individual essays remains disputed among historians.
The collection is often cited as a source for understanding the original intent of the Constitution's framers, and is frequently referenced in American constitutional law, judicial opinions, and political theory. The essays addressed objections raised by Anti-Federalists and argued for a stronger, more centralized federal government than existed under the Articles of Confederation, while attempting to assuage fears that such a government would become tyrannical.
Historians and legal scholars broadly agree on the circumstances of the Federalist Papers' composition, publication, and immediate political purpose: securing ratification of the Constitution, particularly in the closely contested state of New York. Disagreement persists, however, over how much weight the essays should carry as evidence of the Constitution's original meaning, given that they were persuasive political writing rather than a neutral explanation of the document, and that they represent the views of only three of the Constitution's many framers.
Authorship of a small number of essays (notably essays 18-20, and several others) is disputed between Hamilton and Madison, based on conflicting claims made by the authors themselves later in life and subsequent stylometric analysis. Most attributions are well-established and uncontested.
The essays are also studied independently of their ratification-era purpose as works of political theory, particularly Madison's essays on factions (Federalist No. 10) and the separation of powers (Federalist No. 51), and Hamilton's essays on judicial review (Federalist No. 78) and executive power.