In the US, you don't need to give you passport/ID but a SSN is necessary if you want to finance it—which most people do. And that is the de-facto national ident

In the US, you don't need to give you passport/ID but a SSN is necessary if you want to finance it—which most people do. And that is the de-facto national identification number. So while there are ways around it, most people are led to give that info up voluntarily.