Consider the usefulness of the following:
1. evidence of competency as a motorist (which can optionally also include certification as to your physical or mental fitness) [a Motorist's Certificate of Competency];
2. evidence of automotive financial responsibility (associated with name of motorist specified in item #1 and said certificate number) [such as an appropriate financial responsibility bond, deposit of cash or securities with the State, or, automotive insurance]; AND
3. if somehow one were to have the RIGHT to drive rather than merely privilege, one could also carry evidence of that with oneself too.
If you're a legal resident of the United States or a U.S. citizen then you likely you are eligible for and required to obtain the state-issued the license. Being that I am not technically resident of any state, territory or possession of the United States, I am technically ineligible for licenses issued to residents.