I was on an Amtrak train once when INS people got on and asked to see identification and green cards of people they thought were illegal. One guy just stared when they questioned him in Spanish. He was American, of Filipino background, and spoke no Spanish, and had no green card. Eventually the INS guy decided he wasn’t lying and left.
I hate the idea of carrying “papers” to prove I belong here.
If you go for your drivers license you will now need:
Marriage Certificate
Bith certificate
Social Security card
Two bills to prove your residence