Role of Citizen
A person who is living in the United States who is not a citizen is considered an alien. An immigrant to the U.S. is a person from another country with the purpose of living here. An immigrant would be considered an alien. If a person who is not a citizen wishes to become a U.S. citizen, there are several ways to do this.
The two main ways that an individual can become an American Citizen is by birth and the Naturalization Process.
Citizenship by Birth
A child who is born in the U.S., even if the parents are not citizens, are considered U.S. citizens by birth. Also, a child that is born outside of the United States to military personnel or to individuals working abroad is considered a U.S. citizen. Children born in the U.S. to parents that are not citizens have dual citizenship, U.S. citizenship and citizenship from the country of the parents' origin. Then at 18 years of age, the child may choose one of the countries for permanent citizenship.
Click on the page Citizenship By Naturalization to learn more about the Naturalization Process that those persons desiring to become a U.S. citizen must go through to become an American citizen.