The Federalist (later known as The Federalist Papers) is a collection of 85 articles and essays written by Alexander Hamilton, James Madison, and John Jay under the pseudonym "Publius" to promote the ratification of the United States Constitution. The first 77 of these essays were published serially in the Independent Journal, the New York Packet, and The Daily Advertiser between October 1787 and April 1788.[1] A two-volume compilation of these 77 essays and eight others was published as The Federalist: A Collection of Essays, Written in Favour of the New Constitution, as Agreed upon by the Federal Convention, September 17, 1787 by publishing firm J. & A. McLean in March and May 1788.[2][3] The collection was commonly known as The Federalist until the name The Federalist Papers emerged in the 20th century.Though the authors of The Federalist foremost wished to influence the vote in favor of ratifying the Constitution, in "Federalist No. 1", they explicitly set that debate in broader political terms:

It has been frequently remarked, that it seems to have been reserved to the people of this country, by their conduct and example, to decide the important question, whether societies of men are really capable or not, of establishing good government from reflection and choice, or whether they are forever destined to depend, for their political constitutions, on accident and force.[4]

"Federalist No. 10", in which Madison discusses the means of preventing rule by majority faction and advocates a large, commercial republic, is generally regarded as the most important of the 85 articles from a philosophical perspective; it is complemented by "Federalist No. 14", in which Madison takes the measure of the United States, declares it appropriate for an extended republic, and concludes with a memorable defense of the constitutional and political creativity of the Federal Convention.[5] In "Federalist No. 84", Hamilton makes the case that there is no need to amend the Constitution by adding a Bill of Rights, insisting that the various provisions in the proposed Constitution protecting liberty amount to a "bill of rights". "Federalist No. 78", also written by Hamilton, lays the groundwork for the doctrine of judicial review by federal courts of federal legislation or executive acts. "Federalist No. 70" presents Hamilton's case for a one-man chief executive. In "Federalist No. 39", Madison presents the clearest exposition of what has come to be called "Federalism". In "Federalist No. 51", Madison distills arguments for checks and balances in an essay often quoted for its justification of government as "the greatest of all reflections on human nature."
History
According to historian Richard B. Morris, they are an "incomparable exposition of the Constitution, a classic in political science unsurpassed in both breadth and depth by the product of any later American writer."[6]
The Federal Convention sent the proposed Constitution to the Confederation Congress, which in turn submitted it to the states for ratification at the end of September 1787. On September 27, 1787, "Cato" first appeared in the New York press criticizing the proposition; "Brutus" followed on October 18, 1787.[7] These and other articles and public letters critical of the new Constitution would eventually become known as the "Anti-Federalist Papers". In response, Alexander Hamilton decided to launch a measured defense and extensive explanation of the proposed Constitution to the people of the state of New York. He wrote in Federalist No. 1 that the series would "endeavor to give a satisfactory answer to all the objections which shall have made their appearance, that may seem to have any claim to your attention."[8]

Hamilton recruited collaborators for the project. He enlisted John Jay, who after four strong essays (Federalist Nos. 2, 3, 4, and 5), fell ill and contributed only one more essay, Federalist No. 64, to the series.