Illegal immigration is a result of U.S. citizens wanting cheap labor, and affordable merchandise. No, they do not use up schools, hospitals, freeways, taxes. No more than what is given back. The truth is that most illegal immigrants are below the poverty line, and are denied services granted to citizens. In many cases they contribute taxes with the result of never receiving a refund or social security. Many employers even take advantage of this by pocketing the money taken from each paycheck intended for tax purposes.
If illegal immigration ceased the companies who encouraged undocumented workers would then have to grant workers rights to the citizens being hired. Cost would increase. The majority of spanish speaking citizens are here legally, and I assure you that learning a second language is incredibly difficult. Most americans will never understand that.