On the Fact that if Slavery Made the United States Wealthy, Then Why Isn't Brazil, a Country that Took In 10.7 Times as Many Slaves as the U.S. Did (450,000 Versus 4,800,000) Super Duper Wealthy Instead of the Basket-Case that it Is? - https://www.theroot.com/how-many-slaves-landed-in-the-us-1790873989

 The answer of course is that it wasn't slavery which produced the lion-share of our prosperity but rather our free enterprise system, constitutional government, strong European stock, etc.. I mean, just look at what we've accomplished and compare it to the rest of the world. It isn't even close. Sorry but it's the truth.