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A person born or naturalized in the United States is considered a citizen. The process for becoming a citizen can take years.
a person who was not an american a birth but who has since gained american citizenship
He is a citizen (despite what you may have heard), he is a naturalized American citizen.
They are "Naturalized Citizens".
nothing
A natural born citizen was born in the country. A naturalized citizen took classes, studied, took the required tests about the country's history, politics, and culture, and took an oath of Allegiance to the new country. Both natural born and naturalized persons are considered to be citizens.
It all depends on where he was born
A US citizen? "Native born" if you were actually born in the US - a naturalized citizen if you legally studied entered, applied for, and were granted citizenship after passing the requirements.
Naturalized citizen may be the term you want. Foreign-born is also used.
A naturalized citizen can be a US Senator, although not the US President.
telling a lie to become a naturalized citizen
Basically, any person born in the united state or certain territories of the U.S. is a U.S. citizen regardless of age. Such persons are natural-born citizens. Further, the minor children of naturalized American citizens obtain c itizenship automaticallywhen the parent is naturalized.. This is called derivative citizenship. Age has no bearing on the above.