The Mexican border is too long to make it possible to keep people out. You have to have a disincentive for people to immigrate. The answer is probably a combination of a better economy in their home country (obviously), an ID card requirement and criminal punishment for companies that knowingly employ illegal aliens.
I strongly disagree with the Arizona method of rounding people up who "look like" they might be illegal immigrants because that simply results in profiling of any person with brown skin.
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