"As early as 1858, the ongoing conflict between the North and South over the issue of slavery had led Southern leadership to discuss a unified separation from the United States. By 1860, the majority of the slave states were publicly threatening secession if the Republicans, the anti-slavery party, were elected to the presidency. Following Lincoln's victory over the divided Democratic Party on November 7, South Carolina immediately initiated secession proceedings and, on December 20, its legislature passed the "Ordinance of Secession," which declared that "the Union now subsisting between South Carolina and other states, under the name of the United States of America, is hereby dissolved." After the declaration, South Carolina set about seizing forts, arsenals, and other strategic locations within the state."
"When Abraham Lincoln was inaugurated on March 4, 1861, six more states (Mississippi [1/9], Florida [1/10], Alabama [1/11], Georgia [1/19], Louisiana [1/26], Texas [2/1]) had formally seceded from the Union, and federal troops held only Fort Sumter in South Carolina, Fort Pickens off the Florida coast, and a handful of minor outposts in the South. On April 12, 1861, the American Civil War began when Confederate shore batteries under General P. G. T. Beauregard opened fire on Fort Sumter in South Carolina's Charleston Harbor."
Geeze, read what South Carolina said itself. You slavery deniers should at least read what the slave holding states were giving as their reasons for secession. Not about slavery? Talk about revisionism run amok.
Declaration of the Immediate Causes Which Induce and Justify the Secession of South Carolina from the Federal Union
The people of the State of South Carolina, in Convention assembled, on the 26th day of April, A.D., 1852, declared that the frequent violations of the Constitution of the United States, by the Federal Government, and its encroachments upon the reserved rights of the States, fully justified this State in then withdrawing from the Federal Union; but in deference to the opinions and wishes of the other slaveholding States, she forbore at that time to exercise this right....
The Constitution of the United States, in its fourth Article, provides as follows: "No person held to service or labor in one State, under the laws thereof, escaping 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 service or labor may be due." This stipulation was so material to the compact, that without it that compact would not have been made. The greater number of the contracting parties held slaves, and they had previously evinced their estimate of the value of such a stipulation by making it a condition in the Ordinance for the government of the territory ceded by Virginia, which now composes the States north of the Ohio River
The same article of the Constitution stipulates also for rendition by the several States of fugitives from justice from the other States. The General Government, as the common agent, passed laws to carry into effect these stipulations of the States. For many years these laws were executed. But an increasing hostility on the part of the non-slaveholding States to the institution of slavery, has led to a disregard of their obligations, and the laws of the General Government have ceased to effect the objects of the Constitution. The States of Maine, New Hampshire, Vermont, Massachusetts, Connecticut, Rhode Island, New York, Pennsylvania, Illinois, Indiana, Michigan, Wisconsin and Iowa, have enacted laws which either nullify the Acts of Congress or render useless any attempt to execute them. In many of these States the fugitive is discharged from service or labor claimed, and in none of them has the State Government complied with the stipulation made in the Constitution. The State of New Jersey, at an early day, passed a law in conformity with her constitutional obligation; but the current of anti-slavery feeling has led her more recently to enact laws which render inoperative the remedies provided by her own law and by the laws of Congress. In the State of New York even the right of transit for a slave has been denied by her tribunals; and the States of Ohio and Iowa have refused to surrender to justice fugitives charged with murder, and with inciting servile insurrection in the State of Virginia. Thus the constituted compact has been deliberately broken and disregarded by the non-slaveholding States, and the consequence follows that South Carolina is released from her obligation....