" There would be those, after the war ended, who said that it had been fought over states’ rights or to preserve the Union or for a thousand other reasons and causes. Soldiers, North and South, knew better. “The fact that slavery is the sole undeniable cause of this infamous rebellion, that it is a war of, by, and for Slavery, is as plain as the noon-day sun,” a soldier writing for his Wisconsin regimental newspaper explained in 1862. “Any man who pretends to believe that this is not a war for the emancipation of the blacks,” a soldier writing for his Confederate brigade’s newspaper wrote that same year, “is either a fool or a liar.” 67 By then, the emancipation had begun. "

― Jill Lepore , These Truths: A History of the United States