Entry requirements for U.S. citizens visiting Mexico have changed significantly over the past few years. As of March 10, 2010, all U.S. citizens (including children) must present a valid passport, book or card, for travel beyond the “border zone” into the interior of Mexico.
Additional information about Mexico’s visa requirements can be found on the U.S. Embassy website: http://mexico.usembassy.gov/eng/eacs_sheet.html
Travelers to Mexico should review the current travel advisory and warden messages posted by the U.S. State Department, to stay abreast of the current security situation and to be aware of particular locations where additional caution should be taken while travelling.
The State Department’s current travel advisory for Mexico can be found on the U.S. Embassy website: http://mexico.usembassy.gov/travel-advisory.html