The increasing crop caused a new demand for slaves, and an interstate slave-traffic arose between the Border and the Gulf States, which turned the former into slave-breeding districts, and bound them to the slave States by ties of strong economic interest.
Du Bois highlights the emergence of an interstate slave trade driven by economic interests in the South.
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Let the ears of a guilty people tingle with truth, and seventy millions sigh for the righteousness which exalteth nations, in this drear day when human brotherhood is mockery and a snare.
Our song, our toil, our cheer, and warning have been given to this nation in blood-brotherhood.
But whichever it is, the meaning is always clear: that sometime, somewhere, men will judge men by their souls and not by their skins.
The silently growing assumption of this age is that the probation of races is past, and that the backward races of to-day are of proven inefficiency and not worth the saving.