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> Passports can be quite expensive.

It's $165 per 10 years if you don't lose it or $65 if you just need in place of national ID (i.e. no international travel). I think anyone can save up that much in 10 years, renewals a bit cheaper btw.

> Local state ID cards don't prove citizenship.

No, but to get a Real ID in any state you have to prove you're in the country legally, and in some states to get any form of ID you have to prove that.