The opening of Preface
The object of this work has been from historical data to show that the Southern States had rightfully the power to withdraw from a Union into which they had, as sovereign communities, voluntarily entered; that the denial of that right was a violation of the letter and spirit of the compact between the States; and that the war waged by the Federal Government against the seceding States was in disregard of the limitations of the Constitution, and destructive of the principles of the Declaration of Independence.
The author, from his official position, may claim to have known much of the motives and acts of his countrymen immediately before and during the war of 1861-'65, and he has sought to furnish material far the future historian, who, when the passions and prejudices of the day shall have given place to reason and sober thought, may, better than a contemporary, investigate the causes, conduct, and results of the war.