Come Monday, you better pack your passport for that weekend cruise to Cancun or that quick shopping trip across the U.S.-Mexico border.

Gone are the days when you could just declare your U.S. citizenship and breeze through U.S. Customs at the nation’s land and sea ports.

Even your Texas driver’s license and a birth certificate won’t get you home these days — at least not without some extra questioning from U.S. border inspectors.

After years of delays, the U.S. government on Monday will start requiring U.S. citizens returning home from Canada, Mexico, the Caribbean and Bermuda to show their U.S. passport — or one of five other forms of secure ID — at land borders and sea ports.