Yet you use an opinated source I provided the Ordinances of Secession That is the tell all documents of the reason why they left the union
South Carolina
AN ORDINANCE to dissolve the union between the State of South Carolina and other States united with her under the compact entitled "The Constitution of the United States of America."
We, the people of the State of South Carolina, in convention assembled, do declare and ordain, and it is hereby declared and ordained, That the ordinance adopted by us in convention on the twenty-third day of May, in the year of our Lord one thousand seven hundred and eighty-eight, whereby the Constitution of the United States of America was ratified, and also all acts and parts of acts of the General Assembly of this State ratifying amendments of the said Constitution, are hereby repealed; and that the union now subsisting between South Carolina and other States, under the name of the "United States of America," is hereby dissolved.
Done at Charleston the twentieth day of December, in the year of our Lord one thousand eight hundred and sixty.
Mississippi
AN ORDINANCE to dissolve the union between the State of Mississippi and other States united with her under the compact entitled "The Constitution of the United States of America."
The people of the State of Mississippi, in convention assembled, do ordain and declare, and it is hereby ordained and declared, as follows, to wit:
Section 1. That all the laws and ordinances by which the said State of Mississippi became a member of the Federal Union of the United States of America be, and the same are hereby, repealed, and that all obligations on the part of the said State or the people thereof to observe the same be withdrawn, and that the said State doth hereby resume all the rights, functions, and powers which by any of said laws or ordinances were conveyed to the Government of the said United States, and is absolved from all the obligations, restraints, and duties incurred to the said Federal Union, and shall from henceforth be a free, sovereign, and independent State.
Sec. 2. That so much of the first section of the seventh article of the constitution of this State as requires members of the Legislature and all officers, executive and judicial, to take an oath or affirmation to support the Constitution of the United States be, and the same is hereby, abrogated and annulled.
Sec. 3. That all rights acquired and vested under the Constitution of the United States, or under any act of Congress passed, or treaty made, in pursuance thereof, or under any law of this State, and not incompatible with this ordinance, shall remain in force and have the same effect as if this ordinance had not been passed.
Sec. 4. That the people of the State of Mississippi hereby consent to form a federal union with such of the States as may have seceded or may secede from the Union of the United States of America, upon the basis of the present Constitution of the said United States, except such parts thereof as embrace other portions than such seceding States.
Thus ordained and declared in convention the 9th day of January, in the year of our Lord 1861.
North Carolina
AN ORDINANCE to dissolve the union between the State of North Carolina and the other States united with her, under the compact of government entitled "The Constitution of the United States."
We, the people of the State of North Carolina in convention assembled, do declare and ordain, and it is hereby declared and ordained, That the ordinance adopted by the State of North Carolina in the convention of 1789, whereby the Constitution of the United States was ratified and adopted, and also all acts and parts of acts of the General Assembly ratifying and adopting amendments to the said Constitution, are hereby repealed, rescinded, and abrogated.
We do further declare and ordain, That the union now subsisting between the State of North Carolina and the other States, under the title of the United States of America, is hereby dissolved, and that the State of North Carolina is in full possession and exercise of all those rights of sovereignty which belong and appertain to a free and independent State.
Done in convention at the city of Raleigh, this the 20th day of May, in the year of our Lord 1861, and in the eighty-fifth year of the independence of said State.
Tennessee
DECLARATION OF INDEPENDENCE AND ORDINANCE dissolving the federal relations between the State of Tennessee and the United States of America.
First. We, the people of the State of Tennessee, waiving any expression of opinion as to the abstract doctrine of secession, but asserting the right, as a free and independent people, to alter, reform, or abolish our form of government in such manner as we think proper, do ordain and declare that all the laws and ordinances by which the State of Tennessee became a member of the Federal Union of the United States of America are hereby abrogated and annulled, and that all the rights, functions, and powers which by any of said laws and ordinances were conveyed to the Government of the United States, and to absolve ourselves from all the obligations, restraints, and duties incurred thereto; and do hereby henceforth become a free, sovereign, and independent State.
Second. We furthermore declare and ordain that article 10, sections 1 and 2, of the constitution of the State of Tennessee, which requires members of the General Assembly and all officers, civil and military, to take an oath to support the Constitution of the United States be, and the same are hereby, abrogated and annulled, and all parts of the constitution of the State of Tennessee making citizenship of the United States a qualification for office and recognizing the Constitution of the United States as the supreme law of this State are in like manner abrogated and annulled.
Third. We furthermore ordain and declare that all rights acquired and vested under the Constitution of the United States, or under any act of Congress passed in pursuance thereof, or under any laws of this State, and not incompatible with this ordinance, shall remain in force and have the same effect as if this ordinance had not been passed.
[sent to referendum 6 May 1861 by the legislature, and approved by the voters by a vote of 104,471 to 47,183 on 8 June 1861]
Ordinances of Secession 13 Confederate States of America