Wait so... you're saying that if America didn't benefit from slavery economically in the long run, then capitalism can't have been the motivator for slavery?How would mass chattel slavery have made any sense whatsoever without a capitalistic incentive? Whether or not it worked has nothing to do with motive or opportunity.
The article pointed out that slavery held back the south and did not benefit the north.
Indeed. But that goes against the Narrative; so shut up.
That which follows the numerous windings of the Ohio upon the left is called Kentucky, that upon the right bears the name of the river. These two States only differ in a single respect; Kentucky has admitted slavery, but the State of Ohio has prohibited the existence of slaves within its borders
Thus the traveller who floats down the current of the Ohio to the spot where that river falls into the Mississippi, may be said to sail between liberty and servitude; and a transient inspection of the surrounding objects will convince him as to which of the two is most favorable to mankind. Upon the left bank of the stream the population is rare; from time to time one descries a troop of slaves loitering in the half-desert fields; the primaeval forest recurs at every turn; society seems to be asleep, man to be idle, and nature alone offers a scene of activity and of life. From the right bank, on the contrary, a confused hum is heard which proclaims the presence of industry; the fields are covered with abundant harvests, the elegance of the dwellings announces the taste and activity of the laborer, and man appears to be in the enjoyment of that wealth and contentment which is the reward of labor.
Alexis De Tocqueville Democracy in America (1831)