If someone asks for your ID (and you're of driving age), you probably whip out your driver's license. In personal identification circles, what you obtain from your state's department of motor vehicles is considered a de facto national ID because most adults carry one and most places that require ID accept it. 
But it's not really a national ID. Each state has its own DMV, with its own computer systems, and its own unique license characteristics for protecting their integrity. Not surprisingly in the post 9/11 age, there are those in government who wish we'd all just carry a single, United States ID card--maybe even one that contains biometric data about us.

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