Even then, most of them will be back in the U.S. within a few days or weeks, so this is not solving the problem of immigration. The reason people come here is for opportunity, and so, a better investment than walls and border guards, would be improving the opportunities in Mexico and Central America, so they have more choices and more opportunities to live a better life in their own country. For example, many U.S. companies have located factories in Mexico, especially along the border with the United States, but these factories pay low wages and many could be seen as little more than sweatshops. If major U.S. companies invested more money in Mexican outlets that paid decent wages, they would offer jobs to more Mexican citizens, keeping them in their country instead of entering ours illegally. Even more important, however, are the social services and government services that are available here. Mexico has not invested in the healthcare and educational systems that we have, and many...

If the U.S. invested money in the Mexican social system, it would be an excellent investment, because, combined with better job opportunities, it would keep more people in their own country. Without the need to leave to better themselves, many illegals would choose to stay closer to their families and loved ones, and more money would stay in the country, as well. Today, illegals send a major portion of their incomes home to families, and many do not pay income taxes. An investment in Mexico would certainly take time to coordinate and implement, but in the end, it would end up saving the American taxpayers money, it seems.
In conclusion, legal immigration has been a long-standing tradition in America, and immigration is not the problem. Illegal immigration, from any country, is the real problem, and addressing it could lead to better conditions in America, and Latin America and that would be a very good thing.