Batswana nationality law is regulated by the 1966 Constitution of Botswana, as amended; the Citizenship Act 1998, and its revisions; and international agreements entered into by the government of Botswana. These laws determine who is, or is eligible to be, a national of Botswana. 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. The Botswana nationality is typically obtained on the principle of jus sanguinis, i.e. by birth to parents with Botswana nationality. It can be granted to persons who have lived in the country for a specific period of time, who have performed distinguished service to the nation or who have an affiliation to the country