Just like in the old USSR.
An internal passport is an identity document that may or may not be used by a country to control and monitor the internal movement and residence of its people. Internal passports have been used by Imperial Russia and its successor states, France, the Confederate States of America, the Soviet Union, the Ottoman Empire, South Africaduring apartheid, and other countries. Countries that currently have internal passports include Russia, China, Iraq, and Ukraine.
https://en.m.wikipedia.org/wiki/Internal_passport
You don’t know how lucky you are
back in the USSR.
Except Mexican illegals can show their photo-copied get-out-of-jail free card from their closest illegal alien security immigration department law office. (Er, MALDEF, La Raza, or NAACP. Or CAIR, HAMAS, or ISIS/ISIL.)
I like it......the reason is that so many illegals have fake documents and passports are one thing that can’t be faked. Finally the United States is getting smart.