When did Alexander Hamilton write his first federalist papers or the book?

Alexander Hamilton wrote his first Federalist Paper in October 1787. The collection, known as "The Federalist," was published to promote the ratification of the United States Constitution and consisted of 85 essays. Hamilton co-authored the papers with James Madison and John Jay, with the majority of the essays being attributed to Hamilton. The first few essays were published in New York newspapers, beginning a pivotal discussion on the new government.