You wrote:
the white slaves (former Confederates) owned by those states in the north that enslaved them
No white former Confederates were enslaved by "those states in the north", or by any state of the Union, or by the Union itself.
The demonstration of your error is the fact that no deeds of ownership of such human property exist.
Wrong! The states were sovereign. Southern SOVEREIGN states left the union. The union brought them back at gun point.
That there is a white female slave market in the Middle East TODAY with no deeds of ownership in existence is demonstration of the fact that you don’t have the slightest idea what you are talking about.
Enslaved = slavery.
Period.