In particular the demand for partly white slaves to serve in the ‘Big House’ and mostly white female slaves to serve in the brothels greatly increased.
Things were incredibly more diverse in the South than are typically known. Louisiana is jaw droppingly complex compared to most of the rest, yet comparing them to, say, North Carolina of the time, it is amazing they could both exist in the same United States.
Here is a well written piece on the subject:
http://christophelandry.com/2011/02/04/louisiana-myths-quadroons-octoroons/