That's from the secession document proclaimed by the State of South Carolina. Seems they weren't as convinced of the permanent legality of slavery when debating the issue in 1860 as you are posting from your computer in 2021.
Perhaps it's you who engage in circular reasoning. You always begin with what you wish to end up with. No matter how many facts prove the contrary to be true, you cling to the lost cause like a flat earther shutting his eyes when shown a photo of our planet from space.
It's about economics and the abuse of power in Washington DC. You know, the same crap we are dealing with now, from the same sources in Washington DC, enabled by the same rich "elites" in the Northeast.