How can an illegal alien in the US become a citizen without being deported?

Answer 1

Basically in a lot of cases if they have children they will be allowed to stay.

AnswerIn some cases the individual will be asked to leave the country voluntarily and then apply for a visa using normal procedures. Most cases are decided on an individual basis pertaining to the person's circumstances, such as how they entered the country (student or work visa that has expired) if they have married, what their employment status is and so forth. More information can be found on the United States Citizenship and Immigration Services website

You can change your status if you meet the following sections --

You may have a chance to become a citizen depend on - if you married to U.S. citizen your spouse may file for petition of deportation relief if necessary or

if your child was born in U.S. soil and have a birth certificate or

you could file i-589 Asylum case if you were from the country of persecution or even if you were out of visa status and you were so qualified professional worker on your field then the employer might make a petition for you to get a green card but it takes times.

And if you get enlisted in the U.S. Army with your special skills as Interpreter or etc. gov might sponsor you to live legal status and way to GC and citizen.

Hope it will help

Answer 2

They don't. They are sent home.