All persons born or naturalized in the United States, and subject to the jurisdiction thereof, are citizens of the United States and of the state wherein they reside. No state shall make or enforce any law which shall abridge the privileges or immunities of citizens of the United States; nor shall any state deprive any person of life, liberty, or property, without due process of law; nor deny to any person within its jurisdiction the equal protection of the laws. – XIV Amendment to the U.S. Constitution

Most people become U.S. citizens in one of two ways:

• By birth, either within the territory of the United States or to U.S. citizen parents, or

• By naturalization.

In addition, in 2000, Congress passed the Child Citizenship Act (CCA), which allows any child under the age of 18 who is adopted by a U.S. citizen and immigrates to the United States to acquire immediate citizenship.

Naturalization

Naturalization is the process by which U.S. citizenship is conferred upon a foreign citizen or national after he or she fulfills the requirements established by Congress in the Immigration and Nationality Act (INA). The general requirements for administrative naturalization include:

• a period of continuous residence and physical presence in the United States;
• residence in a particular USCIS District prior to filing;
• an ability to read, write, and speak English;
• a knowledge and understanding of U.S. history and government;
• good moral character;
• attachment to the principles of the U.S. Constitution; and,
• favorable disposition toward the United States.

All naturalization applicants must demonstrate good moral character, attachment, and favorable disposition. The other naturalization requirements may be modified or waived for certain applicants, such as spouses of U.S. citizens. Recent changes in immigration law and USCIS procedures now make it easier for U.S. military personnel to naturalize.

Citizenship of Children

The 14th Amendment of the U.S. Constitution guarantees citizenship at birth to almost all individuals born in the United States or in U.S. jurisdictions, according to the principle of jus soli. Certain individuals born in the United States, such as children of foreign heads of state or children of foreign diplomats, do not obtain U.S. citizenship under jus soli.

Certain individuals born outside of the United States are born citizens because of their parents, according to the principle of jus sanguinis (which holds that the country of citizenship of a child is the same as that of his/her parents). The U.S. Congress is responsible for enacting laws that determine how citizenship is conveyed by a U.S. citizen parent or parents according to the principle of jus sanguinis. These laws are contained in the Immigration and Nationality Act.

In addition, Each year, many people adopt children from outside the U.S. The Child Citizenship Act of 2000 (CCA) grants those children the ability to automatically become U.S. citizens when they immigrate to the United States.