The book "History of the War between Mexico and the United States, with a preliminary survey of its origin, Volume 1" by Meyer, Branz, is an important historical document that examines the conflict between the two countries in the 19th century. The author reveals in detail the causes of the conflict, its course and consequences through the prism of documentary materials and historical evidence. In the first volume of the book, the reader gets acquainted with the previous events that led to the war, analyzes the political situation and conflict situations between Mexico and the United States. The author reveals the key points and decisions that led to the emergence of armed clashes and the onset of hostilities. Meyer, Brantz manages not only to present facts and numerous analyses, but also to provide the reader with a deep understanding of how historical events and decisions affect the destinies of these countries and international relations in general. The book will be a useful source of knowledge for historians, political scientists and anyone interested in world history and diplomacy.