The cause of the great War of the Rebellion against the United States will have to be attributed to slavery. For some years before the war began it was a trite saying among some politicians that 'A state half slave and half free cannot exist.' All must become slave or all free, or the state will go down. I took no part myself in any such view of the case at the time, but since the war is over, reviewing the whole question, I have come to the conclusion that the saying is quite true.

The American Civil War (ACW), also known as the War of the Rebellion, the Great Rebellion, and several other names, was a civil war that was fought in the United States of America from 1861 to 1865. Fearing that the future of slavery was in jeopardy after the election of an anti-slavery U.S. president, eleven slave-holding U.S. states located in the southern United States declared their secession from the country and formed the Confederate States, also known as "the Confederacy", sparking war. Led by Democrat Jefferson Davis, they fought against the United States, also known as "the Union", led by Republican Abraham Lincoln, which consisted of every free U.S. state as well as five slave-holding states, known as "border states". In 1865, after four years of warfare, the Confederacy surrendered, and slavery was abolished in the United States with the ratification of the Thirteenth Amendment to the United States Constitution by three-fourths of the states.