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Jus soli

Birthright of anyone born in the territory of a state to nationality or citizenship

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Through Rights, Citizenship and Americas

Jus soli is the predominant rule in the Americas; explanations for this geographical phenomenon include the establishment of lenient laws by past European colonial powers to entice immigrants from the Old World and displace native populations in the New World, along with the emergence of successful wars of independence movements that widened the definition and granting of citizenship, as a prerequisite to the abolishment of slavery since the 19th century.

There are 35 countries that provide citizenship unconditionally to anyone born within their national borders. Some countries outside the Americas with mixed systems extend jus soli citizenship on a limited basis to children who are not otherwise eligible for any national citizenship, such as children born to women who are unwed or from countries that do not recognize maternal jus sanguinis citizenship. Others impose a residency requirement requiring parents to live in the country for a certain number of years before children born in the country become eligible for conditional jus soli citizenship. These mixed systems were implemented to fulfill treaty obligations after the atrocities of World War II increased awareness about the vulnerability of stateless persons. When the sovereignty over a territory is transferred from one state to another, individuals may be given the right of option of nationality based on jus soli or other rules.

Background

Jus soli, sometimes called lex soli, is the principle of citizenship acquired by the place of birth. French jurist Charles Demolombe invented the term around 1860. Children born to a parent in the diplomatic or consular service of another state are often not eligible for jus soli citizenship in a host State.

Unconditional jus soli is mostly found in the Americas. Some countries outside the Americas with mixed systems extend jus soli citizenship on a limited basis to children who are not otherwise eligible for any national citizenship, such as children born to women who are unwed or from countries that do not recognize maternal jus sanguinis citizenship. Others impose a residency requirement requiring parents to live in the country for a certain number of years before children born in the country become eligible for conditional jus soli citizenship. UNHCR gives ten reasons for why people become stateless including laws related to marriage, administrative practices, renunciation of citizenship and nationality laws that discriminate on the basis of gender.

There is a trend in some countries toward restricting jus soli by requiring that at least one of the child's parents be a citizen, national or legal permanent resident of the state in question at time of the child's birth.

Reduction of statelessness

Countries that have acceded to the 1961 Convention on the Reduction of Statelessness are obligated to grant nationality to people born in their territory who would otherwise become stateless persons. These mixed systems were implemented to fulfill treaty obligations after the atrocities of World War II increased awareness about the vulnerability of stateless persons.

The American Convention on Human Rights similarly provides that "Every person has the right to the nationality of the state in whose territory he was born if he does not have the right to any other nationality."

Birthright citizenship

The New Oxford American Dictionary defines birthright citizenship as "a legal right to citizenship for all children born in a country's territory, regardless of parentage". In the United States jus sanguinis is not a constitutional right or a birth right. Citizenship by jus sanguinis is a legal status conferred by statute. The term birthright citizenship usually means jus soli citizenship.

Birthright citizenship is rooted in colonial history when settlers born in the colonial United States were considered "natural born" subjects of the King of England. The idea of conferring citizenship based on being born within the borders of the United States comes from this history. Allegiance based on natural law principles was the core concept of citizenship in Calvin's Case in which Edward Coke said that "they that are born under the obedience, power, faith, ligealty or ligeance of the King are natural subjects and no aliens". The American concept of citizenship is derived from republican principles and may have been influenced by the French writer Emer de Vattel.

Abolition

Countries have been restricting the right of jus soli in order to discourage birth tourism, anchor babies and illegal immigration, for example with the British Nationality Act 1981. India has abolished jus soli largely in reaction to illegal immigration from Bangladesh. A person who was born in India from 26 January 1950 until 1 July 1987 is a citizen by birth, regardless of the parents' nationality. It was restricted in 1987 to people with at least one parent who was a citizen. As of 2008, a person born in India is a citizen only if at least one parent is a citizen, and the other parent is a citizen or a legal migrant. New Zealand abolished unrestricted birthright citizenship in 2005. Around 9% of all births in the United States in 2023 were to mothers who were illegal immigrants or who had legal temporary status in the U.S.

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