Causes of the American Civil War: Spoiler Alert: It Was All About Slavery
There was actually only one cause for the American Civil War: slavery. All the events leading to the Civil War, understood as steps moving steadily up the conflict, had slavery as the underlying cause for upset and increasing division between the North and South.
In 1935, the former Confederate captain, legislator, and historian Samuel A'Court Ashe (1840-1938) explained the reason for the Southern states' secession in his pamphlet A Southern View of the Invasion of the Southern States and the War of 1861-1865, writing:
Seven states seceded in the winter of 1860-61, and, on March 11, 1861, formed a new Confederacy of sovereign States with virtually the same Constitution as the United States. It created "a government proper," and the laws of Congress acted directly on individuals. The other Southern States seceded later when called on to engage in a war against this new Confederacy.
Why was that first secession? African slavery had existed in every colony and State and was particularly recognized and cared for in the Constitution, every State agreeing to return to the owner any fugitive slave. Without this recognition, there could have been no Union. An eminent justice of the United States Supreme Court, Henry Baldwin, of Pennsylvania, had declared slavery "the cornerstone" of the Government (Johnson vs. Tompkins, 1, Baldwin).
In time, the Northern States, whose shipping had brought many of the Negroes into the country, abandoned slavery. Still, every man who held office swore to support the Constitution. There was only one honest way out of the obligation to respect slavery, and that was to withdraw from the Union.
(45-46)
Samuel A'Court Ashe's work is not the only one to make clear that the preservation of the institution of slavery was at the heart of the Confederacy, the reason for secession, and the ultimate cause of the American Civil War. The Constitution of the Confederacy references slavery several times, as in Article 1, Section 4:
No bill of attainder, ex post facto law, or law denying or impairing the right of property in negro slaves shall be passed.
And in Article IV, Section 3:
No slave or other person held to service or labor in any State or Territory of the Confederate States, under the laws thereof, escaping or lawfully carried into another, shall, in consequence of any law or regulation therein, be discharged from such service or labor, but shall be delivered up on claim of the party to whom such slave belongs, or to whom such service or labor may be due.
These are only two citations, but there are many others in the document, making it clear that the institution of slavery was central to the Confederate States of America. Correspondence, editorials, and some, though not all, of the documents relating to the Ordinance of Secession make clear that the fear of the emancipation of the slaves by Northern states was the cause for secession, leading to the Civil War.
The events listed below, all having to do with slavery, bear this out as each one was another step leading to the eventual conflict that tore the nation apart between 1861 and 1865. In the words of the narrator of the excellent Kings & Generals video regarding the underlying cause of the war: "Spoiler Alert: It was slavery."
Invention of the Cotton Gin in 1793
Slavery was becoming economically untenable before the invention of the cotton gin by Eli Whitney in 1793, which made cotton cultivation far more profitable than it had been and increased the need for slave labor to pick the cotton to be fed into the gins. Prior to the cotton gin, one sack of cotton could be produced for sale in a day; afterwards, 50 sacks or more could be made ready for sale in the same amount of time. The gin extracted the seeds from the cotton, eliminating that step in the process, and so all a planter needed was manual labor to pick the cotton. The more workers one had, the greater one's profit, and so the need for more and more slaves.
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