alt Hacker NewsYou don't expand beyond the settlement - your fields are already there. You leave the settlement to tend the fields. You can't wall all the fields but you can wall the village.
expanding is done when the fields get too far to walk there and back in a day. Then you make a new village.
more likely you practice what birth control you can to limit population. Your other choice is go to war and kill some other village so your kids can move there. There was essentially no unclaimed land you could expand into.
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> You can't wall all the fields but you can wall the village.
An interesting take on this is depicted in Attack on Titan, where they do in fact wall all the fields - the city (I don't remember if it's like the last vestige of humanity or whatever) is surrounded in concentric ring walls, the outer one which contains villages and farmland having a circumference of about 3000 kilometers for an internal area of 723,822 km², making its area just a bit smaller than Zambia and Chile.
Of course, a 3000 kilometer, 50 meter tall wall is ridiculous. But then again the great wall of China is 21.000 kilometers long. I believe there's more info about the walls and their construction in the source.
I agree. The main point here is that the inability to put the farm inside the walls provides necessary motivation to have people go out and get bit, which is what we need for the story to happen.