> US still doesn't have a national-wide internal ID, and for the thing what essentially replaced it in function - driver's ID, every state has it's own format and idea what should be in it.
One of the nation-wide IDs actively in use is the tuple (state, driver_license_number).
Each identifier identifies a person. A person may have multiple identifiers. I have a non-US nationally-unique drivers license ID and a passport number.
One of the nation-wide IDs actively in use is the tuple (state, driver_license_number).