>>938438699 (OP)
Initially it was the portugal jews, then the jews from netherlands.
Chatolics cannot commerce in slavery, but Portugal gave citizenship to every people in every isle they take from all around Africa and the Indian Ocean. Both jews and muslims were full citizens of Portugal and the jews in particular were super eager to ship african niggers all around the world.
Spain is totally innocent, you find very fews niggers in mexico or venezuela, but a whole lot in brazil.
So, blame Portugal for the early slaves, but even better, blame jews.