"Abraham Lincoln: The Leader of the People in the Struggle for National Existence" is a book written by George Haven Putnam, which reveals to the reader the life and activities of one of the greatest politicians in the history of the United States - Abraham Lincoln. The work reflects the complex political path that Lincoln led during the Civil War and reveals him as a true leader who took responsibility for the future of his country. The book helps to better understand the history of the United States and the influence that Abraham Lincoln had on the formation of the modern American state.