What is calhoun referring to when he says "the relation now the two? "

I think John Calhoun was pertaining to the present relationship (at that time) with both races in the Slaveholding States. He was talking about the decent condition of slaves on slave states and compared it with other slaves in other countries. Moreover, he sees it as not evil but a good a positive good that the change gives a humane overview.

Ibelieve b) recall election