It's in the second sentence of the declaration of secession for Mississippi.
"Our position is thoroughly identified with the institution of slavery-- the greatest material interest of the world." [0]
"Our position is thoroughly identified with the institution of slavery-- the greatest material interest of the world." [0]
The same article of the Constitution stipulates also for rendition by the several States of fugitives from justice from the other States.
The General Government, as the common agent, passed laws to carry into effect these stipulations of the States. For many years these laws were executed. But an increasing hostility on the part of the non-slaveholding States to the institution of slavery, has led to a disregard of their obligations, and the laws of the General Government have ceased to effect the objects of the Constitution.