Go to the sectary of state and apply for one.
It's called a John or Jane Doe depending on the gender.
You can not.
In the US you might be able to buy EUROs at a AAA office.
You DO NOT need an I.D. to fly within the U.S.. Tell the airline at check in you don't have your I.D. and require screening. They will give you a boarding pass with "SSSS" on it. When you get to the...