Currently, Title 8 of the U.S. Code fills in the gaps left by the Constitution. Section 1401 defines the following as people who are "citizens of the United States at birth:"
- Anyone born inside the United States *
- Any Indian or Eskimo born in the United States, provided being a citizen of the U.S. does not impair the person's status as a citizen of the tribe
- Any one born outside the United States, both of whose parents are citizens of the U.S., as long as one parent has lived in the U.S.
- Any one born outside the United States, if one parent is a citizen and lived in the U.S. for at least one year and the other parent is a U.S. national
- Any one born in a U.S. possession, if one parent is a citizen and lived in the U.S. for at least one year
- Any one found in the U.S. under the age of five, whose parentage cannot be determined, as long as proof of non-citizenship is not provided by age 21
- Any one born outside the United States, if one parent is an alien and as long as the other parent is a citizen of the U.S. who lived in the U.S. for at least five years (with military and diplomatic service included in this time)
- A final, historical condition: a person born before 5/24/1934 of an alien father and a U.S. citizen mother who has lived in the U.S.
* There is an exception in the law — the person must be "subject to the jurisdiction" of the United States. This would exempt the child of a diplomat, for example, from this provision.
Anyone falling into these categories is considered natural-born, and is eligible to run for President or Vice President. These provisions allow the children of military families to be considered natural-born, for example.
Separate sections handle territories that the United States has acquired over time, such as Puerto Rico (8 USC 1402), Alaska (8 USC 1404), Hawaii (8 USC 1405), the U.S. Virgin Islands (8 USC 1406), and Guam (8 USC 1407). Each of these sections confer citizenship on persons living in these territories as of a certain date, and usually confer natural-born status on persons born in those territories after that date. For example, for Puerto Rico, all persons born in Puerto Rico between April 11, 1899, and January 12, 1941, are automatically conferred citizenship as of the date the law was signed by the President (June 27, 1952). Additionally, all persons born in Puerto Rico on or after January 13, 1941, are natural-born citizens of the United States. Note that because of when the law was passed, for some, the natural-born status was retroactive.
The law contains one other section of historical note, concerning the Panama Canal Zone and the nation of Panama. In 8 USC 1403, the law states that anyone born in the Canal Zone or in Panama itself, on or after February 26, 1904, to a mother and/or father who is a United States citizen, was "declared" to be a United States citizen. Note that the terms "natural-born" or "citizen at birth" are missing from this section.
In 2008, when Arizona Senator John McCain ran for president on the Republican ticket, some theorized that because McCain was born in the Canal Zone, he was not actually qualified to be president. However, it should be noted that section 1403 was written to apply to a small group of people to whom section 1401 did not apply. McCain is a natural-born citizen under 8 USC 1401(c): "a person born outside of the United States and its outlying possessions of parents both of whom are citizens of the United States and one of whom has had a residence in the United States or one of its outlying possessions, prior to the birth of such person." Not everyone agrees that this section includes McCain — but absent a court ruling either way, we must presume citizenship.
A "national" is a person who is considered under the legal protection of a country, while not necessarily a citizen. National status is generally conferred on persons who lived in places acquired by the U.S. before the date of acquisition. A person can be a national-at-birth under a similar set of rules for a natural-born citizen. U.S. nationals must go through the same processes as an immigrant to become a full citizen. U.S. nationals who become citizens are not considered natural-born.
Becoming a citizen
A non-citizen may apply to become a citizen of the United States. At no time will such a person ever be considered natural-born (unless the U.S. Code is changed in some way). The process to become a citizen involves several steps, including applying to become and becoming a permanent resident (previously known as a resident alien), applying to become and becoming naturalized, and finally taking the Oath of Allegiance to the United States. Children of naturalized U.S. citizens generally become citizens automatically, though they will also not be considered natural-born. There is a time constraint before a permanent resident can apply for naturalization, generally either 3 or 5 years. The other requirements are that there be a minimum length of time in a specific state or district, successful completion of a citizenship exam, ability to read, write, and speak English, and good moral character.
The Oath of Allegiance to the United States
The following is the text of the Oath of Allegiance:
I hereby declare, on oath, that I absolutely and entirely renounce and abjure all allegiance and fidelity to any foreign prince, potentate, state, or sovereignty, of whom or which I have heretofore been a subject or citizen;
that I will support and defend the Constitution and the laws of the United States of America against all enemies, foreign and domestic;
that I will bear true faith and allegiance to the same;
that I will bear arms on behalf of the United States when required by the law;
that I will perform noncombatant service in the Armed Forces of the United States when required by the law;
that I will perform work of national importance under civilian direction when required by the law; and
that I take this obligation freely, without any mental reservation or purpose of evasion; so help me God.
Losing your citizenship
For a natural-born citizen, losing your citizenship is actually quite difficult. The law prohibits the taking of your citizenship against your will, but there are certain actions a citizen can take which are assumed to be a free-will decision that constitutes a voluntary renunciation of the citizenship.
Moving to another country for an extended period of time does not constitute an act that presumes renunciation. Neither does taking a routine-level job with a foreign government. This stand is quite different from U.S. policy of the past, where even being naturalized in another nation could be seen as renunciation. The sections of the law that pertained to losing ones nationality for many of these cases was found at 8 USC 1482 and related sections.
The U.S. Code does, however, see some acts as creating the possibility of a loss of nationality. When you lose your U.S. nationality, you are no longer under the protection or jurisdiction of the United States. When the United States considers you to no longer be of U.S. nationality, it in effect considers you to no longer be a citizen. Note that these are things you can do that may force you to lose your citizenship. The law also says that these acts must be voluntary and with the intent of losing U.S. citizenship. The ways to lose citizenship are detailed in 8 USC 1481:
[list=][*]Becoming naturalized in another country
[*]Swearing an oath of allegiance to another country
[*]Serving in the armed forces of a nation at war with the U.S., or if you are an officer in that force
[*]Working for the government of another nation if doing so requires that you become naturalized or that you swear an oath of allegiance
[*]Formally renouncing citizenship at a U.S. consular office
[*]Formally renouncing citizenship to the U.S. Attorney General
[*]By being convicted of committing treason[/list]http://www.usconstitution.net/choose.html