@jeffcliff @matrix A race has about a 0% chance of going extinct due to not having enough children. The conditions that lead to people having few children disappear as a population shrinks, and people start having lots of children again. The only things that could actually be a danger regarding organic population growth are substance abuse and abortions, which both cause lasting damage to the reproductive system.
Birthrates being higher=more power was only true in the era of swords and bows. Nigeria has 190 million people and Iceland has less than 400000, but do you see it as a real possibility that nigeria might be able to mount an invasion of scandinavia? Every serious war between a white nation and a black nation in modernity has ended with the black nation curbstomped. Africa might have a population that greatly outnumbers white continents but they have neither the industry, the social discipline nor the food independence to be a serious threat to any other continent, a few fleets could easily blockade the surrounding seas and drop the continent into a famine that would kill half the population. Even their population growth is a direct result of white interference in the form of humanitarian aid.
The only reason blacks are anywhere near an issue is because white countries let them. The situation is different with Asia, but the middle east tears itself apart constantly and east Asia would rather have economic influence than outright colonization.
Racial separation would only benefit whites. If that wasn't the case, blacks would be demanding to be left alone, not that whites let them take over their countries. The few times they've gotten whites to leave them alone the result has been famine.