A Critical Period in American History is a book by prominent American historian John Fisk that explores the period from the end of the Revolutionary War to the adoption of the US Constitution. The author analyzes in detail the political, social and economic aspects of this period, demonstrating its decisive importance for the formation of a new state. The book is an important source for those interested in the history of the United States and the mechanisms of the development of democracy. With insightful analysis and insightful observations, A Critical Period in American History is essential reading for anyone interested in American history and politics.