The book "Observations on the new constitution, and federal and state conventions, made by a Colombian patriot" by Mercy Otis Warren is an important political treatise written during the formation of the United States of America as an independent country. In this work, the author analyzes the new US federal constitution, compares it with the decisions of federal and state conventions, reveals the advantages and disadvantages of the new political system. Through her insightful observations and reasoned conclusions, Mercy Otis Warren offers a unique perspective on key aspects of the development of constitutional foundations in the early period of the history of the young American state.