How does Calhoun’s speech justify the institution of slavery within the framework of states’ rights?

“Esteemed colleagues, I stand before you as a steadfast guardian of our states’ rights and traditional institutions. Our Constitution guarantees that each state must retain the authority to determine its own affairs without unwarranted federal interference. In matters pertaining to slavery, this principle of self-governance is both a safeguard and a bulwark of our societal order. I hold that the institution of slavery, deeply woven into our cultural and economic fabric, is a legitimate and necessary practice for many states. The autonomy granted to each state includes the power to maintain traditions that have long sustained their communities. In defending these cherished customs, we affirm the diversity that constitutes our nation and protect the liberties enshrined in our founding document. Let us then resist any attempts to impose a uniform standard that disregards local history and values.”
John Calhoun, States’ Rights Address, 1847