Why are they so different? Pakistan is also poor, so why is population growth ending there, but not in Nigeria? Also, why is Ukraine being depopulated? They have cute girls!
Niggers and shitskins breed as a form of retirement. They literally will not survive without a child to provide for them, plus they have higher mortality rates so it's a risk to just have 1-2 children who might not make it to their 30s and provide for them in their 60s-70s.