@Brerzerk
Would America and European powers have the wealth they do if many of them did not benefit from 400yrs of free, skilled labor?
A better question would be - was slavery the main engine of the large increase in productive wealth in the 18th and 19th centuries? I think not.
Would they be as knowledgeable in even basic metallurgy to the level of the then enslaved?
To my knowledge, the main advances in metallurgy during the 18th and 19 the centuries were in electroplating, electrolysis and steel production. None of which had anything to do with slavery, but everything to do with scientific and technological progress and economic competition within Europe and America.
Real question is what point are you trying to make?
Your point appears to be that Western countries owe a debt to blacks, in general, or, perhaps, black Americans and Caribbeans, in particular. One manifestation of which apparently should be unlimited access to live in Western countries in perpetuity.
My counter point is there should be no such debt (whether considered in moral or financial terms), because I think non-Western countries would end up owing Western countries much more than the other way round. Better to think in terms of credit than debt. Credit implies respect and recognition; debt implies bondage or gratitude.