Who are you to determine who should have kids? Look at Europe and Scandinavia with their near-zero birth rates. How is that working out for them?
The problem with Africa's population is so well known that you would do better to Google it than waste my time splain' it to you.
In the meantime, say "hi" to your new tenants. They are headed your way and ready to move in with you. I'm sure you'll be happy to feed and house them: