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Crossing the U.S./Canada Border? Bring Documentation
Travelers are no longer allowed to simply declare their citizenship to immigration officers at U.S/Canada border crossings. Those aged 19 and older must now show a passport, a "trusted traveler" card or a birth certificate along with government-issued identification, such as a driver's license. A driver's license isn't considered proof of citizenship but can document the bearer's identity in support of other proof. For resident aliens, an original "green card" constitutes proof of permanent U.S. residence and, together with photo ID, will suffice to re-enter the country.