Aliens

Foreign-born persons who have not been naturalized to become U.S. citizens under federal law and the Constitution.

The federal immigration laws determine whether a person is an alien. Generally, a person born in a foreign country is an alien, but a child born in a foreign nation to parents who are U.S. citizens is a U.S. citizen. The term alien also refers to a native-born U.S. citizen who has relinquished U.S. citizenship by living and acquiring citizenship in another country. Aliens are categorized in several ways: resident and nonresident, immigrant and nonimmigrant, documented and undocumented ("illegal").