Generally speaking, industrialization greatly reduced social inequality by creating a "middle class" of people, who were able to significantly increase their incomes due to the large number of jobs available in factories.
A few of the significant changes is our spine, and also we used to have a tail.
Restrict voting--use of Literacy Tests and the Grandfather Clause
Labor contracts--keep former slaves in the fields to continue plantation labor
Maintain social hierarchy--punished those who paid blacks more for work as well as laws to control where blacks could live.
The Black Codes were a way to maintain social, political, and economic hierarchy with whites on top while moving from a slave system.
