That’s an interesting point, Yaelle. What do you show to get a social security number? (it’s been soooooo long since I got mine, I can’t remember if you had to produce a birth certificate).
It seems like there is a lot to know about the process, in 1936 only people in covered occupations could have one.
The Story of the Social Security Number https://www.socialsecurity.gov/policy/docs/ssb/v69n2/v69n2p55.html
I don’t remember. My kids got their SS cards at birth, but how? Maybe it is something hospitals give you a form for?
That is one of the most telling things about the case of Barack Obama. He never had a legit SS number. From age 16-the presidency.