Well i have news for you.
The birth rate at which a population can sustain its self is 2.1, anything above that is growth.
Western countries like the US, The UK, France, Germany.... the birth rate is 1.4 to 1.7. So in the west our population from births is shrinking, its why our governments are quite happy to keep the boarders open.
In south American counties the birth rate is 2 to 3, on the African continent the birth rate is 3 to 6.
So, are you sure about that? And do you want to tell them to stop breeding?
The reason both South American and African countries have a high birth rate is because of the very high mortality rate. It's very rare for most African countries for instance, to actually have a population large enough to even be able to support an infrastructure through taxes.