Nigerian nationality law is regulated by the Constitution of Nigeria, as amended, and various international agreements to which the country is a signatory. These laws determine who is, or is eligible to be, a national of Nigeria. The legal means to acquire nationality, formal legal membership in a nation, differ from the domestic relationship of rights and obligations between a national and the nation, known as citizenship. Nationality describes the relationship of an individual to the state under international law, whereas citizenship is the domestic relationship of an individual within the nation. Commonwealth countries often use the terms nationality and citizenship as synonyms, despite their legal distinction and the fact that they are regulated by different governmental administrative bodies. Nigerian nationality is typically obtained under the principal of jus sanguinis, i.e. by birth to parents with Nigerian nationality. It can be granted to persons with an affiliation to the country, or to a permanent resident who has lived in the country for a given period of time through naturalisation. As Commonwealth citizens, Nigerians are eligible to vote in UK elections and serve in public office there. Nationality can be obtained in Nigeria at birth or later in life through naturalisation. Typically, in Nigeria, there are no provisions to acquire nationality through jus soli, i.e. by birth in the territory, which means that foundlings or orphans whose parents are unknown are stateless. Those who are eligible for nationality by birth include: Persons born anywhere whose parents are Nigerian nationals; or Persons born in Nigeria who have at least one grandparent who was Nigerian, or belonged to an indigenous community of Nigeria prior to independence. Naturalisation can be granted to persons who have resided in Nigeria for a sufficient period of time to confirm they understand the customs and traditions of the country and the responsibilities of citizenship.