In the Indian subcontinent, Pakistan is ranked 74th in the order of birth rates. India is ranked 86th in the world and Bangladesh is ranked 89th. 

Also, when Europe went through its population explosion in the 19th and 20th centuries, they migrated to the new world in the millions. The same thing should be allowed for the Africans and Asians. The Africans will pour into Europe, and turn the natives there into a minority. Just like the immigrating Europeans turned the natives here into a minority.