There are three bases for U.S. Citizenship: birth, blood, and naturalization. If an individual is born in the United States, he or she receives citizenship by jus soli, that is, by right of birthplace. If a child is born to at least one U.S. citizen, anywhere in the world, that child is a U.S. citizen by jus sanguinis, that is, right of blood. The process of naturalization is more complex, and involves acquiring citizenship by legal means. There are a number of requirements that must be met in order to be eligible for citizenship by naturalization, including an age requirement, a knowledge of English, a knowledge of U.S. history and government, and several more concerning residency and character.