Crossing the Canadian or Mexican border: If you are a U.S. or Canadian citizen and want to take a short trip across the U.S. borders, you will need proof of citizenship when crossing by land or sea.

Americans flying to Mexico now need a passport to get back home. Starting Monday, the U.S. government requires a passport or proof of citizenship, such as a birth certificate, for all air travelers arriving from countries within North America , Mexico.

By the end of the month, air travelers will again need passports when flying between the USA and Mexico and the Caribbean (including Bermuda). Faced with an overwhelming backlog of passport applications, the Department of Homeland Security issued a temporary ruling in June that allowed air travelers to fly as long as they carried proof that their passports were pending, according to Travel Weekly.