Look at Wisconsin for example. There is no history of slavery or plantation farming in Wisconsin. Where then did all the blacks come from? Blacks came to Wisconsin and other Northern industrial states in the early 20th century to fill the need for manual labor. Fast forward to the 1990's. The USA started de industrialization big time. Now we have city after city of blacks idled by the globalist elites. They broke their rice bowl which ironically to the Chinese is the worst thing you can do to a person.
A wise black friend once told me that the blacks that left the south for the big cities were the blacks who were rebelling away from their black Christian roots. They wanted to escape being subject to any one telling them what was right, accountability. I have no idea if this is true, but this is what an older black once told me.
Perhaps then Trump can give incentive for American companies to come back to the US and start creating jobs. The US has the highest corporate tax in the world.