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The context of that Quote was the Americas...Its interesting that you brought up the racism of the European slave trade tho because the quote "All men are created equal" has its origins in Christianity..and the rise of the christian religion is intertwined with the rise of european racism vis a vis the curse of cain/ham (whichever way you wanna go with that)
The Christian English/spanish/portugese slave traders had to come up with the very same justifications for slavery because the bible (their constitution) told them all men were supposed to be equal before God
So what of these black men they were putting in chains ...they had to be declared to be less than human..right

it would seem you actually are further confirming sowells point
Thats actually misleading..there was a huge demand for agricultural labor but the slaves in the new world did way more than that there were plenty of skilled slave craftsmen blacksmiths stonemasons and so on...colonies need more than agriculture..they needed infrastructure.

How else did many of all those grand old colonial buildings get built.
Or the common sense approach that brutality is necessary if youre going to work someone to death without paying them..Slavery is always brutal even when both parties have the same skin tone...jussaying

Maybe you should watch more than 60 seconds before jumping to conclusions...this is a complex issue not a vine