It all boils down to proof of citizenship.
Anybody can have a driver's license . . . and they're thinking of giving some to immigrants and/or illegal aliens.
When young, I was told that a passport declares your citizenship while a driver's license just says you can drive and that a (local/state) government is "in the know" about you.
There is one loop around this, though. A birth certificate does not declare that the birthland is the current citizenship. (However, most countries always allow those who were born within to come back.)
Now, the only thing left for us to do is to suspect each other.
