The same way they came is the same way they can go back. They were not forced to be here. If they want to be here do it the LEGAL way or Gtfo.
They aren't going to go back, they are here for a reason. They aren't forced to be here, but they obviously feel its a better opportunity. The government won't be able to send every illegal immigrant back to where they came from. You can keep them without any rights, and then watch the crime rate increase as people do desperate things to survive. Because even if they are doing dirt to survive here, they still feel its better than home. Not everybody feels that way, but many do. Some people do go back by the way because they don't like the lifestyle here.
Mexican children have over populated the public school system and apply for free lunch and breakfast to eat everyday. They do not pay taxes that American citizens do. They do not contribute to the economy because they refused to use US banks, and get paid under the table. They also assume that they should be allowed to buy things without a credit history when citizens have to work hard to keep a credit history to buy a home, etc. Mexican's apply for food stamps and public housing/affordable housing, Mexicans apply for scholarships and financial ad. Most of the time they either are allowed to have it or they lie about their status on papers.

