We have no absolute moral obligation to everyone in the world. Many individuals are now calling for serious reductions in foreign aid and in foreign interventions in order to help Americans who are also suffering. That suffering is no less worthy of support just because it is not as highly publicized or televised on international news. Times may be difficult in Mexico, but they are difficult in America as well, and a country has an obligation to its citizens first, and then everyone else. It is legitimate and justified to build a fence to protect the American economy.