"The Federalist" is a collection of essays and literature, which is one of the most important works of political theory in the history of the United States of America. Written by Alexander Hamilton, John Jay, and James Madison, these works were intended to influence the political development of the country during the debate over the ratification of the US Constitution. In their essays, the authors consider the issues of the structure of state power, the distribution of competences between the federal and regional authorities, arguing the need to preserve the unity of the country and revealing the principles of federalism. "The Federalist" leaves an indelible mark in political science and legal documentation, becoming a source of inspiration for subsequent generations of legal scholars and politicians around the world.