In the US, a person can get a new SSN if their current SSN is heavily used in identity fraud. I've heard its a high bar, but technically a person can be associated with more than one SSN.
Getting an SSN for your child isn't compulsory, so the system also isn't expected to hold every person.
For the majority of people, it's 1-to-1. But it's not guaranteed that an SSN identifies a person (if it's been replaced) or that a person has an SSN (if their parents were lazy or are sov-cits)
Getting an SSN for your child isn't compulsory, so the system also isn't expected to hold every person.
For the majority of people, it's 1-to-1. But it's not guaranteed that an SSN identifies a person (if it's been replaced) or that a person has an SSN (if their parents were lazy or are sov-cits)