The rules require most U.S. citizens entering the United States from Mexico at sea or land ports of entry to have a passport, passport card, or other travel document approved by the Department of Homeland Security.
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All U.S. citizens need U.S. passport books if re-entering by air. Land and sea border crossings accept additional travel documents, such as U.S. Passport cards and Trusted Traveler cards. Child travelers have additional options - see the Traveling with Children section.
If you enter or leave Mexico, you must declare any sum of money equaling US$10,000 or more that you bring in cash, checks, money orders, other cashable documents or a combination of them. Failing to declare carries a fine ranging from 20% to 40% of the exceeding amount.
In most cases, travelers are permitted to bring up to $800 worth of merchandise back to the United States without having to pay duty. (Numerous exceptions apply.)
U.S. citizens who travel as tourists beyond the “border zone” or enter by air must fill out an Official Entry Immigration Form (FMM), which is provided by commercial airlines or at the Mexican airport of entry.
The USA Requires a Tourist Visa for MexicansThe USA requires Mexicans to apply for a Tourist Visa. The application process is complicated; the application instructions are 83 pages long and in English. The cost is high, and the processing time is long.
In the vast majority of the world, there are full border checks, with stamps, on entry as well as Exit. No eyebrows raised about missing Exit stamps at all. Mexico has not been stamping passports for departing passengers since the late 1980's.