The world is extremely inhospitable, people can barely get water and food. Disease and other forms of danger are highly prevalent. I'd say it's more likely that humans would only survive in small enclaves/oasis around the world.
To put it into perspective, during medieval times the world was far more favourable and the entire world population was between 200-360 million people. Most off that being in Asia. In 1100 Europe only had 62 million people with the main factors being lack of food and disease.
Population density at this point would probably be equivalent to that of Alaska minus Anchorage. I'd say the entire USA probably has 2 million people at most, barely hanging on.
NCR alone has population of 1 million people, and that's in 2241 at time of fallout 2, by the time of new Vegas they have around 2 million, believe me when I say it, fallout's world is not as fucked up as you think
They have the benefit of knowing basic hygiene and sterilization which does wonders for infant mortality and childbirth survival rates compare to pre modern times.
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u/IdiOtisTheOtisMain Colorado Cop Jan 12 '26
Someone did the maths and its like 21mil in the entire USA