I'll use images & words.
Imagine being stacked on top of someone like a box or package and remaining that way for months (though the middle passage).
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Then when the ship is too slow or their isn't enough food ration out, imagine being thrown overboard.
That event was called the Zong Massacre the epitome of the injustice.
Here's the memorial images.
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Again, I'm not disputing that nor have I attempted too.
What I am saying however is, Black's couldn't enslave whites and inflict the same amount injustice or hardships on them.