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theres literally no information out there that accurately proves that a nation's population wont gradually increase on its own, over time, without the help of immigration.
As a country becomes more depopulated, labor becomes more valuable, which increases salaries, times of economic security create spikes in births.
The only reason underpopulation is treated like an immediate threat, is because companies are too afraid that the value of labor will increase. But there is no evidence that suggests that populations do not go through waves of increased population and decreased population over time.
There is no evidence that a country which goes through dips in population will "collapse" or go "completely extinct" and most of this is presented to make the case for an "immediate man made solution" to a problem which would naturally fix itself.