Why morgage lender ask applicants if they are citizens, or PR, H1B holder or not?

There is a Patriot Act form to fill in with some
ID information. There are two groups of ID
and you need to submit one in each group.

Driver license and green cards belong to Group A
and SSN card belong to Group B.

But Driver license does not reveal one's immigration status
and I am not sure about SSN card (that is why one need
to get a no-legend SSN card after getting GC)
 
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