It is 50% about states rights and 50% about the government not enforcing the then constitution.

It’s just convenient that both those were directly related to slavery. Definitely not the reason for succession 😂 It’s been taught in the South for years this way.

Just in case you don’t know the SC articles of recession specifically mention the personal liberty laws passed by northern states.

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>

They are specifically referring to the fugitive slave act of 1793 and 1850 and the government not enforcing the states to abide by the Constitution.

We affirm that these ends for which this Government was instituted have been defeated, and the Government itself has been made destructive of them by the action of the non-slaveholding States. Those States have assume the right of deciding upon the propriety of our domestic institutions; and have denied the rights of property established in fifteen of the States and recognized by the Constitution;>