Earlier this week, the Department of Homeland Security and the Department of State issued a joint reminder that, as of January 31, 2008, all adult travelers entering the U.S. through land and sea ports of entry will be required to show proof of citizenship. This proof could include a birth certificate or a driver’s license.

This new requirement is part of a larger transition toward the Western Hemisphere Travel Initiative (WHTI), which will establish a range of documentation requirements for all travelers entering the U.S. (including citizens of the U.S., Canada and Bermuda).

Right now, U.S. Customs and Border Protection are allowed to accept oral declarations of citizenship from U.S. and Canadian citizens attempting to enter the U.S. from a land or sea border. But, as of January 31, 2008, these oral declarations will no longer be considered proof of citizenship. All U.S. and Canadian citizens, age 19 and older, will need to show a government-issued ID. All individuals age 18 and younger will only be required to show proof of citizenship. Please note that passports will continue to be accepted when attempting to cross land or sea borders.