That’s true for some but not others, 100 years ago, or longer it was a struggle to survive day to day.
There was no electricity, no one had a car, no one had a telephone, no one had quality medical care, every day it was hard to find enough food for everyone to eat.
Basically there was no Government to speak of, my Grandmother was lucky she got to go to school and learned how to read and write.
A lot of people did keep correspondence, but many did not so keeping track of things like births, deaths, etc were not kept or recorded.