Additionally, some American citizens do not have a Social Security number. https://en.wikipedia.org/wiki/Social_Security_number#Non-universal_status https://en

Additionally, some American citizens do not have a Social Security number. https://en.wikipedia.org/wiki/Social_Security_number#Non-universal_status https://en.wikipedia.org/wiki/Social_Security_number#Non-uni... Bear in mind this fact when working on systems that make use of SSNs.