Question, have you even read the Secession documents?
Every single fucking one of them mentions slavery in the first paragraph.
I take no issue with Southerners having pride over their heritage, and the demonization of Confederate Veterans in recent decades, such as the Great Robert E. Lee, is a crime and needs to be rectified. But to try and blatantly lie and say that Southern States seceded for a noble, non-slavery cause just makes you look like a weasel who needs to whitewash their history to take pride in it.
From the 2nd sentence of Georgia the first fucking state in the link you referenced.
"For the last ten years we have had numerous and serious causes of complaint against our non-slave-holding confederate States with reference to the subject of African slavery. They have endeavored to weaken our security, to disturb our domestic peace and tranquility, and persistently refused to comply with their express constitutional obligations to us in reference to that property, and by the use of their power in the Federal Government have striven to deprive us of an equal enjoyment of the common Territories of the Republic."
If you think that they seceded due to slavery you are unfathomably retarded.
Same link you provided. This one is south Carolina.
"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. Since that time, these encroachments have continued to increase, and further forbearance ceases to be a virtue."
No state mentions slavery as the cause. They all cite violations of the constitution BECAUSE they are slave states not because they want to specifially keep slavery.
You can't even be bothered to read the own link you provided because if you did you never would have posted something so silly and easily debunked.