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by int_19h 3290 days ago
Or legal aliens, like tourists. Or foreigners, who aren't even in the country. Or really anyone else who doesn't work in the country, and doesn't have to report taxes.

Ironically, many illegal immigrants actually do report taxes. In which case they use ITIN, which is compatible to SSN format-wise (###-##-####)... but it is not unique over time.