What are you Prepping for.

[Mortblanc]

That is almost a direct reflection of Frederic Jackson Turner, the founder of the study of American History as we know it today. Except Turner stresses developmental change rather than decline.

https://en.wikipedia.org/wiki/Frontier_thesis

Turner's work was in 1893, 60 years earlier. Turner was still living in the era of accent. The frontier had just been declared at an end by the 1890 census. Every state in our union had more then 2 people per square mile. Some still barely top that number.

What that means is that it was post WW2 before the first wave of frontiersmen was over and the second wave had developed in many areas.