Indentured servants were people who worked to get transportation, land, clothes, food or shelter instead of money. In chattel slavery people are considered property instead of workers or servants, they do not have the right to freedom unless they purchase themselves or they are freed by their masters.
When slavery was abolished ex-slaves and African Americans needed work, but they did not have any education or money to purchase land. This way, they became indentured servants in some places, because working they were able to get land, clothes and shelter instead of money.
The results of this shift is that ex-slaves and African Americans remained some way tied to those people who owned the land, because most of indentured servants died before meeting the end of their working terms. It was mostly a slavery but they did get something in exchange for their work.
