In the US nobody would want an official single identifier across multiple services and agencies like that, even though our SSN is essentially used that way. People don’t want to be tracked and linked by a single identifier, arguably because it would be abused by commercial and/or government interests, and then there’s the conspiracy nuts that would come up with who knows what reasons, and religious nuts that view a unique identifier as a “mark of the beast” or whatever.

People a fucking weird over here.