...You seem to be going out of your way to bring in Arabs as well as to shift the focus from the European transporters to Africans...
Just helping to spread the good cheer... spreading the blame to the historically accurate multiple parties who share substantial guilt in the matter.
The bizarre fact is, slavery has appeared on every continent and within every race; Europeans enslaving Europeans, Africans enslaving Africans, Asians, Native Americans etc, so its presence in Africa was the norm in the world -- not the exception...
It's also largely a matter of when slavery was ended as a practice, in Region A or B, and, in connection with One's Own, rather than The Other Guy.
...What was new about the transatlantic commerce was the concept of shipping said slaves to an entirely different part of the world on a journey that to its human cargo must have seemed effectively like one of us being abducted by aliens and sent to a distant planet. It was a whole new level of meaning to the already-iffy concept of slavery and begat the invention of the instrument used to justify such a new paradigm: racism...
Yep.
...Africans did not invent that. Nor did Arabs.
Hmmmmm...
You seem in rather insistent upon defending Africans and Arabs in this matter.
Perhaps I should not have chimed-in with an accurate sharing of the blame amongst parties... it detracts from the Bash ****** Festival.
Meanwhile...
I don't know enough about African slavery across the continent to say whether they invented anything analogous in their own travels, although, my Spidey-Sense tells me that they were sufficiently 'local' or 'regional' so that there was very little cross-over between regions within the African continent, for slavery that they practiced in the inner regions.
I DO know that the Muslim-Arab slavers of the Barbary Coast and beyond (east and west along the shores of the Med) engaged in the bulk transport of their slaves throughout much of the then-known world, to include all of North Africa, the Middle East, Turkey, Persia and beyond, so, I'm not so sure the Arabs deserve to be let off the hook as lacking something analogous in their own right.
The Muslim-Arab slave-trade was far too profitable not to have invented such analogies over the many and long centuries that they were the world's Premiere Slave Traders.