so you are saying that immigration control knows every single illegal immigrant that gets into the country. If you believe that you are either incredibly foolish or incredibly dense.
You could give ICE the ENTIRE US BUDGET and they would still not be able to track down and deport every illegal immigrant in the US. Funnily enough if someone does not want to be found and they work hard it, they can hide. Illegal immigrants do not tell people they are illegal immigrants. They do not tel people where they are going or where they have come from, and most of the time use false names and identification so unless you know every single person's whereabouts at every moment, you will not know whether they are who they say there are.
Also, a source for immigration to the US for you:
"In 2014, 1.3 million foreign-born individuals moved to the United States, an 11 percent increase from 1.2 million in 2013. India was the leading country of origin for new immigrants, with 147,500 arriving in 2014, followed by China with 131,800, Mexico with 130,000, Canada with 41,200, and the Philippines with 40,500."
http://www.migrationpolicy.org/artic...-united-states
Notice how middle Eastern countries are not top of the list, and also notice that maybe you should be building a giant roof instead as more immigrants to the US come from overseas than your nearest neighbor, but heaven forbid you don't demonise the nearest "other" you have!