The ideal common ancestry procreational distance for your mate is 50, plus or minus 25 for some wiggle room. If you procreate outside of this band on the low side, the problems are outlined in what everyone already knows, don't have kids with your cousins. The problems that occur on the high side, when you mate with someone 500 thousand or god help you a million procreations removed, as is the case with blacks and whites, then we have little data about what goes wrong, beyond the fact that you have a 99.9% chance of an Anti-evolution, that is, you don't get an in-between, you get less than an in-between because issues have to be corrected in regard to the fact that your common ancestor was when there was a land bridge at the equator between Brazil and western Africa and you could simply walk across, which humans provably did.
https://www.youtube.com/watch?v=QDGpgfy1jgk

Don't mate with monkeys okay gang? You're NOT going to have a good time. Mate within your race, and make sure your common ancestor to your mate was in the last 400 years. Mark my words we got some silverback gorillas larping as humans hoofing it around, and no amount of Jewish cultural jelly like slime you partake in, will make them humans.