Passports Required 

Starting Tuesday, air travelers who are citizens of Canada, Mexico, and Bermuda, as well as U.S. citizens returning home, must display passports to enter the United States.

Until now, all that had been required was a birth certificate or driver’s license.

Tourism officials say the new passport requirements will cost New Hampshire and Maine thousands of visitors and millions of dollars.

This is just for air travelers, but the Western Hemisphere Travel Initiative, which is slated to go into effect next year would require everyone crossing the border from Canada into the U.S. to show a passport or passcard.