@Justicar Can be your concubine. Not mentioning mixed are at least more inteligent and can be used as workforce. Not mentioning you can give black women to low value white men to keep them happy and keep them working.
But useless if you want low population with intelligent people.
In todays day and age it is more logical to have less kids to focus on quality over quantity.
But in the end it comes to what kind of future people want.