Immigration law is about national government policies which control the immigration to the country. Immigration law, regarding foreign citizens, governs the legal status of people, in matters such as citizenship. Immigration laws govern who can enter the U.S., how long they can stay, what they can do while they are here, and how they can become American citizens.
Immigration attorneys represent people who want to come to the United States, whether it be for school, work, or just a visit. Immigration lawyers can also help undocumented immigrants found living in the U.S. without permission.If you are not a U.S. citizen and want to apply for a green card or other visa, or if you are already in the U.S. and have been threatened with deportation, an immigration lawyer can help you.
USCIS is the US Government agency that determines and processes immigration into the United States. The website is very comprehensive and gives a lot of information. Here is the site: