Yes, they do.
Why would an immigrant need to talk to INS about a marriage?
Immigrant means they are already residing in the US legally as a immigrant.
Through the US citizen spouse can get green card after two years of marriage and after 3rd anniversary can apply for US citizenship using Form N-400.
As long as they are a legal immigrant, there should be no problems. If they are not legal, it could result in deportation.
Once you are officially married to an American citizen, you can not be deported from the country, unless you engage in a criminal offense.
You will be under a ban on re entering the US for 3 years. After that you can enter through the marriage visa.
No. If he was illegal before, he's still illegal. He will need to go through the system to seek a green card. If he already has violated U.S. laws, he may never be able to seek citizenship.
No, You can only become a citizen if you apply for you citizenship through immigration. Being a legal resident and married to an American citizen can and will not change your immigrant statics unless you go through the right process.
No, the UK citizen would not become a US citizen. First the UK citizen would have to apply through INS for a work permit and perminent residency. The work permit will be issued within month (probably), but perminent residency could take 18 months or more; during which time the applicant would be expected to remain and work in the US (short overseas visits sometimes permitted). Once perminent residency has been established a 'green card' will be issued and 3-5 years after this the immigrant can apply for US citizenship.
Children who are born in the US to US Parents will automatically become US Citizens by birth. If they are born outside the US also they can get their citizenship status through their parents.
If you went through the legal channels and got a license, not a do it your self kit off the internet or some Vegas chapel, etc. Each state would have the opportunity to challenge it if it were not legal.
Yes, the illegal immigrant has to return to Mexico and obtain an entry permit. \
Sometimes. The immigrant must follow the same procedures and apply for the green card. Often, they must voluntarily return to their home country to wait for their visa and permission to come through.
No................. The only way they can become a US citizen would be to go back to their home country and then apply for a fiance visa, and then you have to go through all kinds of forms to make it happen. It is pretty well cut and dried here, once an illegal, always an illegal, unless you go through the proper channels. Go to USCIS.gov