The South seceded because they had been itchin to...
The fires were burning many, many years before 1861, This is fact.
The slavery issue was a major one in the preceding presidential election. (not to mention the high intensity of the full 1850's decade...)
The South was itching for a fight, and they intended to take it home over that issue.
Let's go back, 4 years earlier, to just before the November, 1856 election.
Here is an article from ---->
OCT 1856, from the New York Times, quoting a Richmond
editorial, entitled:
LOOK THE FUTURE IN THE FACE
...where future secessionists threaten war and the evil of what they term "Black Republicanism" (their term for the Republicans who favored emancipation ) is castigated, and where they predict, nay - taunt, the coming bloodbath.
I present a picture of the actual paper below...read it:
Here is the top line:
It begins:
"The Southern political Press has never been more open and frank in its avowal of political purposes and plans, than it is during the present canvass.
The triumphs of Slavery during the past four years,--the successful repeal of the Missouri Compromise, a measure for which oven Mr. CALHOUN never dared to hope,--and the ready, eager promptitude with which the Democratic party at Cincinnati yielded to the exactions of the Slaveholding power, seemed to have inspired the political leaders of the South with the belief, that time has come when they can safely and even with advantage to themselves, make open proclamation of the projects they have in store for the future.
....We invite attention to the following lead editorial from Richmond (the NY Times here quotes from the Southern paper
) where Southerners state: "'Tis treason to cry "Peace!" "peace!" when there is no peace. There is, there can be, no peace, no lasting union between the south and Black Republicanism."
And they go on:
Forewarned...Forearmed!" We see the numbers, the characters, the designs of our enemies/ Let us prepare to resist them and drive them back
....A common danger from without, and a common necessity (Slavery) within,
will be sure to make the South a great, a united, a vigilant and a warlike people."
..
",...the division is sure to take place...Socialism, communism, infidelity,licentiousness and agrarianism, now scarcely suppressed by union with the conservative South will burst forth in a carnival of blood..."
Those were the Southern sentiments well before the Confederates started seizing forts and arsenals and firing on Unions ships in January of 1861. They continue:
"The great object of the South in supporting Buchanan is to promote and extend the perpetuation of the "conservative institution of Slavery." And the votes by which it is hoped he may be elected, are to become the basis of a secession movement and the formation of a Southern Slave Confederacy...
See the full newspaper article here: (!) Bold Avowals--The Election of Buchanan to be a Stop Towards Disunion. - Article - NYTimes.com
1856. Itchin' itchin itchin.