Well let's think about this for a second...
In the King James Version of the Bible it also says this. Now the King James Version was released in 1611. Slavery started in Virginia Jamestown in 1619. Kinda makes you think...8 years it took them to put that into effect and justify slavery by citing biblical scripture. Also look at this. The Encyclopedias tell us that Africans were forced to abandon their own religions and we're taught Christianity. On top of that there were parts of the Bible redacted and changed, even the Apocrypha was deleted from the Bible which is why Revelation's warnings about plagues has actually manifested 'do not add nor take away from the Bible' I'll try to see if I can post some picture references to the citations I'm referring to. Yes though, I think the inclusion of slavery within scripture was a deliberate action to keep slaves within bondage. You must remember these same people spelled "Whites Only" on their Bibles. This proves to you they not only had no conscience for their own religion, but they also had violated the commandment "Love Thy Neighbor".