A fence hurts our political relationship with Mexico.  The United States needs to demonstrate that it is interested in being a true partner with Mexico in efforts to reduce drug trafficking and the pervasive cartel-driven violence of northern Mexico. Trying to simply keep all the Mexicans out is offensive; the governor of the Mexican state Coahuila has called the fence a "wall of hate",1 and in 2005 Mexican President Vincente Fox called the situation "disgraceful and shameful."2 Many individuals in the Lower Rio Grande Valley of Texas have family and friends on the Mexican side and speak fluent Spanish, and don't support the wall. On the other hand, Arizona's demographics reflect population growth as the result of many Midwestern "snowbirds" with little experience of Latino culture moving there, and thus Arizona has much harsher prejudices against Mexicans.3 If we do not cooperate with Mexico, they will be less likely to share information valuable to our national security or cooperate with us on foreign policy initiatives.  1Hylton, Hillary. "Opponents of the Border Fence Look to Obama."  2Global Security. "US-Mexico Border Fence."  3The Economist. "Good neighbours make fences."