The very best government-issued ID is a passport. You should have one, in case someone asked you to go with them at the last minute to Mexico, or London, or Finland (the happiest place on earth), or just about any other country.
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This is a good time to begin thinking about applying for a passport, especially if you are interested in taking a trip next summer that would involve the use of a passport for you to visit a country requiring it. So far, after applying, you can get the passport back usually at this time of the year within about 2-3 weeks. Waiting until March, it would increase to 5-6 weeks.