I think if you prep, one should at least have enough to take care of their immediate family first, then maybe extended family. I know a guy who bought about 10-20 Mosen-Nagant rifles. He also bought about 200 rounds of ammo for each. He said, if things break down, he is going to give these out to his neighbors who aren't prepared, so they can protect their neighborhood. He said 10-20 guys at the entrance of their neighborhood with rifles and spike bayonets would be a deterrant for would be raiders. He said 2-3 of his neighbors are already preppers, and others are not, don't care, or do not own guns. He said these would be the first ones to squeel for protection in a society breakdown.
Anyways. I hope to retire in a year or two, and am looking for a good place in the country. No matter how much you prep, it is going to be eaten or bartered away for something you forgot. In a rural setting, especially with a lot of trees, one can clear a small plot to raise food or animals, have wood for firewood, building, or tool handles. Can raise medicinal plants, herbs, and spices. Order, store, and use non-hybrid seeds for growing your own.
Average food in cans or dry goods only have dates for about 2-3 years out, so things would have to be rotated. If something goes wrong after a year, one would have to raise their own food.
Whites could sustaing larger populations than American Indians because of domesticated animals, and growing crops. Indians hunted for meat, thus needed more land to roam.
Rotating crops, and seasonal crops can be done in a small space especialy in the south. Where I live, trunips, collards, beats, carrots, onions and such can grow in winter. One can plant a spring crop of "summer veggie" in April, and harvest in June-July. Then plant another summer crop and harvest in Oct and early November. I also was supprised to learn on "Doomsday Preppers that an area about 50'x60' can grow enough wheat for a family of 4 for bread for a year. Another garden that same size can grow a years supply of veggies. Then all you need is maybe a milk goat, some chickens, and maybe a pig or two, and one can have a sustainable life on probably 10-20 acres. You would need a 10 acre pasture animal grazing and to store hay for winter. It would be hard work, but doable. Solar hot water, and heating would cut back on needed firewood except for cooking. Then a good solar cooker would save on firewood. Solar batteries or wind batteries could run a 12 v refirigerator/freezer or two.
Anyways, knowing late 1800's and early 1900's farming technology would help. Living a while with Amish might help also.