Mexico puts out an advisory to its citizens to avoid travel to the United States? Just look at the advisory the Department of State has out on Mexico.
Asking Mexicans to show their papers is child’s play compared to what U.S. nationals can expect in Mexico.
"Violence by criminal elements affects many parts of the country, including urban and rural areas. Visitors to the U.S.-Mexico border region, including cities such as Tijuana, Ciudad Juarez, Nuevo Laredo, Nogales, and Matamoros should remain alert and be aware of their surroundings at all times. In its efforts to combat violence, the Government of Mexico has deployed military troops to various parts of the country. Military checkpoints increased in border areas in early 2008. U.S. citizens are advised to cooperate with official checkpoints when traveling on Mexican highways. Sporadic outbursts of politically motivated violence occur from time to time in certain areas of the country, particularly in the southern states of Chiapas, Guerrero and Oaxaca."
And as for political activities by "foreigners":
"Demonstrations: The Mexican Constitution prohibits political activities by foreigners; such actions may result in detention and/or deportation. Travelers should avoid political demonstrations and other activities that might be deemed political by the Mexican authorities. Even demonstrations intended to be peaceful can turn confrontational and escalate into violence. U.S. citizens are urged to avoid areas of demonstrations, and to exercise caution if in the vicinity of any protests."
And Mexico is criticizing the United States and Arizona?!
"CRIME: Crime in Mexico continues to occur at a high rate, and it can often be violent, especially in Mexico City, Tijuana, Ciudad Juarez, Nuevo Laredo, Acapulco, and the states of Sinaloa and Durango. Other metropolitan areas have lower, but still serious, levels of crime. The low rates of apprehension and conviction of criminals also contribute to Mexico’s high crime rate."
And forget about personal safety...
"Personal Safety: Visitors should be aware of their surroundings at all times, even when in areas generally considered safe. Women traveling alone are especially vulnerable and should exercise caution, particularly at night. Victims, who have almost always been unaccompanied, have been raped, robbed of personal property, or abducted and then held while their credit cards were used at various businesses or Automatic Teller Machines (ATMs). Travelers should avoid any overt displays of wealth such as showing money, wearing flashy jewelry, driving expensive automobiles, etc. U.S. citizens should be very cautious in general when using ATMs in Mexico. If an ATM must be used, it should be accessed only during the business day at large protected facilities (preferably inside commercial establishments, rather than at glass-enclosed, highly visible ATMs on streets). U.S. and Mexican citizens are sometimes accosted on the street and forced to use their ATM cards to withdraw money from their accounts.
Kidnapping, including the kidnapping of non-Mexicans, continues to occur at alarming rates. So-called express kidnappings, i.e., attempts to get quick cash in exchange for the release of an individual, have occurred in almost all of Mexico’s large cities and appear to target not only the wealthy but also the middle class. Concerned U.S. citizens, as well as U.S. businesses with offices in Mexico, may contact the U.S. Embassy or any U.S. consulate to discuss precautions they should take.
Kidnapping in Mexico has become a lucrative business, whether the kidnappings are actual or ‘virtual’. A common scam throughout Mexico is ‘virtual’ kidnapping by telephone, in which the callers typically speak in a distraught voice in a ploy to elicit information about a potential victim and then use this knowledge to demand ransom for the release of the supposed victim. In the event of such a call, it is important to stay calm, as the vast majority of the calls are hoaxes. Do not reveal any personal information; try to speak with the victim to corroborate his/her identity; and contact the local police as well as the Embassy or nearest consulate.
Criminal assaults have occurred on highways throughout Mexico; travelers should exercise extreme caution at all times, avoid traveling at night, and may wish to use toll ("cuota") roads rather than the less secure "free" ("libre") roads whenever possible. Always keep car doors locked and windows up while driving, whether on the highway or in town. While in heavy traffic or stopped in traffic, leave enough room between vehicles to maneuver and escape, if necessary. In addition, U.S. citizens should not hitchhike or accept rides from or offer rides to strangers anywhere in Mexico. Tourists should not hike alone in backcountry areas, or walk alone on infrequently visited beaches, ruins or trails."
This is what our State Department warns U.S. citizens can expect in Mexico. And Mexico has the nerve to issue a warning on the U.S.