You are a felon subject to deportation if you are again caught in the US after having been booted out. Guess what. It's never enforced
If you are caught entering the USA within 50 miles of the border from Mexico this is a misdemeanor.
If you are caught in the interior United States you are subject to civil penalties which are also never enforced
Each year the Border Patrol is making more than a million apprehensions of people who flagrantly violate our nation's laws by unlawfully crossing U.S. borders to work and to receive publicly-funded services, often with the aid of fraudulent documents. Such entry is a misdemeanor and, if repeated, becomes punishable as a felony. Over eight million illegal immigrants live in the United States -- some estimate even more.
In addition to sneaking into the country in violation of the immigration law that requires that aliens be documented for legal entry (referred to as "entry without inspection -- EWI"), others enter with legal documentation and then violate the terms on which they have been admitted by taking jobs that are not authorized or overstaying the authorized period of stay in the country. The INS estimated in 1996 that about 60 percent of the then estimated five million illegal immigrants were EWI and 40 percent were overstayers. Both types of illegal immigrants are deportable under Immigration and Nationality Act Section 237 (a)(1)(B) which says:
"Any alien who is present in the United States in violation of this Act or any other law of the United States is deportable."