
Historically, that has been true. However, that doesn't mean that it will be true in the future.
Even within developed countries, certain ethnic and religious groups are growing at significant rates even while the population as a whole is stagnant or declining. This will, of course, lead to a change in the ethnic or religious makeup of these countries in the future - as more fundamentalist groups tend to grow while non-fundamentalist groups do not.
Fundamentalists? Really? About the only region that theory could be applied to would be the Islamic nations compared to Western nations.
More highly educated or more affluent populations perhaps grow more slowly or decline which goes back to the earlier post about empowerment of women. In modern cultures women don't want to spend every minute of their lives changing diapers. In third world countries women traditionally are not educated, don't work professionally, are expected to only care for the house and children and they have no birth control. In the US they even get government handouts for each child. In one unnamed Southern California city women have four or five children each with a different father, none of whom contribute any sort of support. All of the nutritional, medical, educational, and health needs are paid for by tax dollars. And they just keep having more babies, but I certainly wouldn't call them fundamentalists.
Life is too short to drink bad coffee.
Life is too short to drink bad coffee.




