The Civil War in the United States is a collection of articles on the American Civil War by Karl Marx and Friedrich Engels for the New York Tribune and Die Presse of Vienna between 1861 and 1862, and correspondence between Marx and Engels between 1860 and 1866. It was published as a book in 1937, edited and with an introduction by Richard Enmale. The articles promote the Union side of the war, arguing that the conflict was fundamentally about slavery.