[Theophilus]

...just as the population growth rates of Europeans in North America slowed drastically when our ancestors hit the end of the frontier.

The damage to our birth rate has nothing to do with the end of any frontier and everything to do with the development of hormonal birth control. If we don't have children, the God fearing meek will inherit the earth. No arbitrary borders will stop them. The extinct are irrelevant.

Psalms 25
12 What man is he that feareth the LORD? him shall he teach in the way that he shall choose.
13 His soul shall dwell at ease; and his seed shall inherit the earth.

[WorldviewDad]

Well said...

God bless...as a father of nine I guess God has already blessed :)