I think we may be taking some of this out of context. If you look at any past peoples it wasn't mental toughness that kept them going. It's all they knew. There was no other way of life. Starving Inuits grew up as starving Inuits or whatever group you want to look at. I'm not discounting the need for mental toughness I'm just saying that we are looking at others through our own eyes and that might not be a good reference point.
Homesteaders of early America took everything with them they could carry whether that was by wagon or by pack horse or mule. They didn't settle until they had found a place that had everything they needed to survive.
One other thought. Some folks might well be able to live for a year in the wilderness. Just remember that you only hear about the 1% that were successful. You don't hear much about the 99% that either gave up and went home or died in the process. (those are my numbers. I just offered them to illustrate my point).
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