Jus soli (English pronunciation: / /; Latin pronunciation: [juːs ˈsɔ.liː]), meaning 'right of the soil', commonly referred to as birthright citizenship, is the right of anyone born in the territory of a state to nationality or citizenship. As an unconditional basis for citizenship, it is the predominant rule in the Americas, but is rare elsewhere. Since the Twenty-seventh Amendment of the Constitution of Ireland was enacted in 2004, no European country grants citizenship based on unconditional jus soli. A study in 2010 found that only 30 of the world's 194 countries grant citizenship at birth to the children of undocumented foreign residents, although definitive information was not available from 19 countries.
Almost all states in Europe, Asia, Africa, and Oceania grant citizenship at birth based upon the principle of jus sanguinis (right of blood), in which citizenship is inherited through parents not by birthplace, or a restricted version of jus soli in which citizenship by birthplace is automatic only for the children of certain immigrants. Countries that have acceded to the 1961 Convention on the Reduction of Statelessness will grant nationality to otherwise stateless persons who were born on their territory, or on a ship or plane flagged by that country.
Jus soli is associated with permissive citizenship rights. Most countries with unconditional jus soli laws tend to give birthright citizenship (and nationality) based on jus sanguinis rules as well, although these stipulations tend to be more restrictive than in countries that use jus sanguinis as the primary basis for nationality.
An early form of jus soli dates from Cleisthenes' reforms of ancient Athenian law in the 6th century BC. It developed further in the Roman world, where citizenship was extended to all free inhabitants of the Roman Empire by the Edict of Caracalla in AD 212.
Much later, the independence of the English colonies in America and the French Revolution in the late 18th century laid the foundations for jus soli. With the social and economic development of the 19th and 20th centuries, and the massive migrations to the Americas and Western Europe, jus soli was established in a greater and greater number of countries.
At the turn of the 19th century, nation-states commonly divided themselves between those granting nationality on the grounds of jus soli (France, for example) and those granting it on the grounds of jus sanguinis (Germany, for example, before 1990). However, since 2007 the European migrant crisis has focused attention on these two conflicting sources of nationality rights.
Lex soli is a law used in practice to regulate who and under what circumstances an individual can assert the right of jus soli. Most states provide a specific lex soli, in application of the respective jus soli, and it is the most common means of acquiring nationality. A frequent exception to lex soli is imposed when a child was born to a parent in the diplomatic or consular service of another state, on a mission to the state in question.
Unrestricted jus soli
- Antigua and Barbuda: Guaranteed by the Constitution. However, one government official told the Center for Immigration Studies that the country's current effort to tighten immigration policies may include an end to automatic birthright citizenship for children of illegal immigrants.
- Barbados: Guaranteed by the Constitution. However, the Barbados Ministry of Labour & Immigration recently proposed ending automatic birthright citizenship.
- Costa Rica (requires registration with the Costa Rican government before the age of twenty-five)
- El Salvador
- Saint Kitts and Nevis
- Saint Lucia
- Saint Vincent and the Grenadines
- Trinidad and Tobago 
- United States: The 14th Amendment to the United States Constitution provides that "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." The phrase "subject to the jurisdiction thereof" excludes children born to foreign diplomats and children born to enemy forces engaged in hostile occupation of the country's territory.
Restricted jus soli
There is a trend in some countries toward restricting lex 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, or requiring that at least one parent have resided in the country for a specific period of time. Modification of jus soli has been criticized as contributing to economic inequality, the perpetuation of unfree labour from a helot underclass, and statelessness. Jus soli has been restricted in the following countries:
- Australia: Since 20 August 1986, a person born in Australia acquires Australian citizenship by birth only if at least one parent was an Australian citizen or permanent resident or after living the first ten years of their life in Australia regardless of their parent's citizenship status (see Australian nationality law).
- Bahrain: Children born to a foreign father with valid residency permits who himself was born in Bahrain have right to citizenship.
- Cambodia: In 1996, Cambodia changed the law to only grant citizenship to children born to foreign parents living legally in the Kingdom of Cambodia (under Article 4(2)(a) of the 1996 Nationality Law).
- Chile: The 1980 Constitution changed the Chilean nationality law to require that children born in Chile of non-citizen parents must request citizenship and that this request be approved by the government.
- Colombia: a person born in Colombia with at least one parent being a Colombian citizen or resident is automatically a Colombian citizen (see Colombian nationality law).
- Dominican Republic: The constitution was amended on 26 January 2010. The amendment broadened the definition of the 2004 migration law – which excluded from citizenship children born to individuals that were "in transit" - to include "non-residents" (including individuals with expired residency visas and undocumented workers).
- Egypt: According to Article 4 of nationality law of the Arab Republic of Egypt, persons born in Egypt gain citizenship at birth if the father also was born in Egypt.
- France: Children born in France (including overseas territories) to at least one foreign parent who is also born in France automatically acquire French citizenship at birth. Children born to foreign parents may request citizenship depending on their age and length of residence (see French nationality law).
- Germany: An exception to the increasing restrictiveness toward birthright citizenship, Germany, prior to 2000, had its nationality law based entirely on jus sanguinis. Now, children born on or after 1 January 2000 to non-German parents acquire German citizenship at birth if at least one parent has a permanent residence permit (and had this status for at least three years) and the parent was residing in Germany for at least eight years.
- Greece: Apart from regulations in past and historic nationality laws of Greece granting nationality jus soli,  Greek Nationality Code of 2004 states that "A person born in Greek territory acquires by birth the Greek nationality if not acquiring alien nationality or is of unknown nationality". Additionally, as from 2015’s amendment of 2004 Cod (Law 4332 of 2015, G.G. A/76/09 July 2015), a child born in Greece by foreign parents, shall acquire the right of Greek nationality with a combination of preliminary school attendance and parents’ legal residence in Greece (5 years, 10 if the child is born prior to 5 years of legal residence). One year after the implementation of the law (as from July 2016), 6,029 children had been granted Greek nationality, out of 27,720 submitted applications.
- Hong Kong: Since the July 1997 transfer of sovereignty over Hong Kong, most political rights and eligibility for most benefits are conferred to permanent residents regardless of citizenship; conversely, PRC citizens who are not permanent residents (such as residents of Mainland China and Macao) are not conferred these rights and privileges. The Basic Law provides that all citizens of the People's Republic of China (PRC) born in the territory are permanent residents of the territory and have the right of abode in Hong Kong. The 2001 case Director of Immigration v. Chong Fung Yuen clarified that the parents need not have right of abode, and as a consequence, many women from Mainland China began coming to Hong Kong to give birth; by 2008, the number of babies in the territory born to Mainland China mothers had grown to twenty-five times the number five years prior. Non-PRC citizens born to non-PRC citizen permanent resident parents in Hong Kong also receive permanent residence at birth. Other persons must have "ordinarily resided" in Hong Kong for seven continuous years in order to gain permanent residence (Articles 24(2) and 24(5)).
- Iran: Article 976(4) of the Civil Code of Iran grants citizenship at birth to persons born in Iran of foreign parents if one or both of the parents were themselves born in Iran. See Iranian nationality law.
- Ireland: On 1 January 2005, the law was amended to require that at least one of the parents be an Irish citizen; a British citizen; a child of a resident with a permanent right to reside in Ireland or In Northern Ireland; or be a child of a legal resident residing three of the last four years in the country (excluding students and asylum seekers) (see Irish nationality law).
- Malaysia: a person born in Malaysia on or after 16 September 1963 with at least one parent being a Malaysian citizen or permanent resident is automatically a Malaysian citizen (see Malaysian nationality law).
- Morocco: A person who was born in Morocco to parents also born in Morocco lands and whose immigration is legal, can register as a Moroccan two years prior to becoming adult.
- Namibia: A person born in Namibia to a Namibian citizen parent or a foreign parent who is ordinarily resident in Namibia, is a Namibian citizen at birth. (see Namibian nationality law).
- New Zealand: Since 1 January 2006 a person born in New Zealand acquires New Zealand citizenship by birth only if at least one parent was a New Zealand citizen or permanent resident (includes Australian citizens and Perament Residents) (see New Zealand nationality law), or if to prevent being stateless.
- Portugal: A child born in Portuguese territory to who does not possess another nationality is a Portuguese citizen. Also, a person born to foreign parents who were not serving their respective States at the time of birth is a Portuguese citizen if the person declares that they want to be Portuguese and provided that one of the parents has legally resided in Portugal for at least five years at the time of birth.
- South Africa: Since 6 October 1995 a person born in South Africa to South African citizens or permanent residents are automatically granted South African citizenship (see South African nationality law).
- Spain: A child born in Spain to foreign parents may acquire Spanish citizenship jus soli if either one of the parents is a permanent resident and legally domiciled in Spain at the moment of the child's birth.
- Sudan: A person born before 1994 gains Sudanese nationality at birth if his father was also born in Sudan. If his father was not born in Sudan, he can apply to the Minister to be granted Sudanese nationality.
- Thailand: Thailand operated a system of pure jus soli prior to 1972, but afterwards, due to illegal immigration from Burma, the Nationality Act was amended to require that both parents be legally resident and domiciled in Thailand for at least five years in order for their child to be granted Thai citizenship at birth. Furthermore, someone who has Thai citizenship by sole virtue of jus soli may be stripped of Thai citizenship under various conditions (such as living abroad) which do not apply to people who have Thai citizenship by virtue of jus sanguinis.
- Tunisia: Individuals born in Tunisia are citizens by birth if their father and grandfather were born in Tunisia. Additionally, the person must declare before becoming an adult (20 years) that he wants to be a citizen.
- United Kingdom: Since 1 January 1983, at least one parent must be a British citizen or be legally "settled" in the country or upon the 10th birthday of the child regardless of their parent's citizenship status (see British nationality law).
Abolition of jus soli
Some countries which formerly observed jus soli have moved to abolish it entirely, conferring citizenship on children born in the country only if one of the parents is a citizen of that country.
- India: Abolished jus soli on 3 December 2004, in reaction to illegal immigration from its neighbor Bangladesh. Jus soli had already been progressively weakened in India since 1987.
- Malta: Changed the principle of citizenship to jus sanguinis on 1 August 1989 in a move that also relaxed restrictions against multiple citizenship.
- jus soli, definition from merriam-webster.com.
- Vincent, Andrew (2002). Nationalism and particularity. Cambridge; New York: Cambridge University Press.
- Rotunda, Ronald D. (16 September 2010). "Birthright citizenship benefits the country". Chicago Tribune.
- Smith, Morgan (16 August 2010). "Repeal Birthright Citizenship — and Then What?". Texas Tribune.
- Feere, Jon (2010). "Birthright Citizenship in the United States: A Global Comparison". Center for Immigration Studies.
- "Nations Granting Birthright Citizenship". NumbersUSA. Retrieved 6 September 2009.
- Gilbertson, Greta (January 1, 2006). "Citizenship in a Globalized World". Migration Policy Institute.
- Vink, M.; de Groot, G. R. (2010). Birthright Citizenship: Trends and Regulations in Europe. Comparative Report RSCAS/EUDO-CIT-Comp. 2010/8 (PDF). Florence: EUDO Citizenship Observatory. p. 35.
- w:fr:Droit du sol
- Guimezanes, Nicole. "What Laws for Naturalisation?" The OECD Observer. Paris: June/July 1994. , Iss. 188; pg. 24, 3 pgs (Cites legislation for Australia, Austria, Belgium, Canada , Denmark, Finland, France, Ireland, Italy, Japan, Luxembourg, Netherlands, New Zealand, Norway, Portugal, Spain, Sweden, Switzerland, Turkey, United Kingdom and the United States)
- Constitution of Antigua and Barbuda: CHAPTER VIII CITIZENSHIP | PERSONS WHO AUTOMATICALLY BECOME CITIZENS AFTER COMMENCEMENT OF THIS CONSTITUTION | Section 113 The following persons shall become citizens at the date of their birth on or after 1st November 1981- a. every person born in Antigua and Barbuda: Provided that a person shall not become a citizen by virtue of this paragraph if at the time of his birth- i. neither of his parents is a citizen and either of them possess such immunity from suit and legal process as is accorded to the envoy of a foreign sovereign power accredited to Antigua and Barbuda; or ii. either of his parents is a citizen of a country with which Her Majesty is at war and the birth occurs in a place then under occupation by that country;
- Jon Feere, "Birthright Citizenship in the United States: A Global Comparison," Center for Immigration Studies
- Constitution of Barbados: CHAPTER II CITIZENSHIP Persons born in Barbados after 29 November 1966: Section 4: Every person born in Barbados after 29th November 1966 shall become a citizen of Barbados at the date of his birth: Provided that a person shall not become a citizen of Barbados by virtue of this section if at the time of his birth – a. his father possesses such immunity from suit and legal process as is accorded to an envoy of a foreign sovereign state accredited to Her Majesty in right of Her Government in Barbados and neither of his parents is a citizen of Barbados; or b. his father is an enemy alien and the birth occurs in a place then under occupation by the enemy.
- "It is the Department's view that the legislation should be amended to stipulate that (as in the United Kingdom and the Bahamas) children born in Barbados will not be deemed to be citizens of Barbados, unless at least one parent at the time of the birth, has permanent status in Barbados. In addition persons born in Barbados should not be deemed to be citizens where the parents are residing illegally in Barbados.
- Jon Feere, Birthright Citizenship in the United States: A Global Comparison, Center for Immigration Studies.
- Constitution of Belize: PART III Citizenship, section 24 "24. Every person born in Belize on or after Independence Day shall become a citizen of Belize at the date of his birth: Provided that a person shall not become a citizen of Belize by virtue of this section if at the time of his birth- his father or mother is a citizen of a country with which Belize is at war and the birth occurs in a place then under occupation by that country"
- Article 12a of the Federal Constitution (translated) says that Brazilians include, "a) those born in the Federative Republic of Brazil, even if of foreign parents, provided they are not in the service of your country". "Neoconstitucionalismo - Análise histórica". JusBrasil.
a) os nascidos na República Federativa do Brasil, ainda que de pais estrangeiros, desde que estes não estejam a serviço de seu paí
- The Constitution of Costa Rica: Title II ARTICLE 13: The following are Costa Ricans by birth: ...2. A child born abroad to a born Costa Rican father or mother, who is registered as such in the Civil Register by the will of the Costa Rican parent during its minority, or by his own will up to the age of twenty-five..."
- The Constitution of the Commonwealth of Dominica Chapter VII Citizenship 98 "Every person born in Dominica after the commencement of this Constitution shall become a citizen of Dominica at the date of his birth: Provided that a person shall not become a citizen of Dominica by virtue of this section if at the time of his birth- a) neither of his parents is a citizen of Dominica and his father possesses such immunity from suit and legal process as is accorded to the enjoyment of a foreign sovereign power accredited to Dominica; or b) his father is a citizen of a country with which Dominica is at war and the birth occurs in a place then under occupation by that country."
- Fiji Constitution: chapter 3, Section 10 Citizenship by birth: Every child born in Fiji on or after the date of commencement of this Constitution becomes a citizen at the date of birth unless, at the date of birth: (a) a parent of the child has the diplomatic immunity accorded to envoys of foreign sovereign powers accredited to Fiji; and (b) neither parent is a citizen.
- Constitution of Jamaica Chapter II Citizenship 3B.-(1): Every person born in Jamaica shall become a citizen of Jamaica – a. on the sixth day of August, 1962, in the case of a person born before that date; b. on the date of his birth, in the case of a person born on or after the sixth day of August, 1962.
- The Constitution of Lesotho, chap. IV, sec. 38 | CHAPTER IV CITIZENSHIP: 38. Persons born in Lesotho after the coming into operation of the Constitution
- CONSTITUCIÓN POLÍTICA DE LOS ESTADOS UNIDOS MEXICANOS – Constitución publicada en el Diario Oficial de la federación el 5 de febrero de 1917 – TEXTO VIGENTE – Última reforma publicada DOF 07-07-2014 Capítulo II De los Mexicanos – Artículo 30. La nacionalidad mexicana se adquiere por nacimiento o por naturalización A) Son mexicanos por nacimiento: I. Los que nazcan en territorio de la República, sea cual fuere la nacionalidad de sus padres. (Translation: "Mexicans by birth are: I. Those born in the territory of the Republic, regardless of the nationality of their parents")
- UN Refugee Agency: Pakistan Citizenship Act, 1951 Section 4. Citizenship by birth: Every person born in Pakistan after the commencement of this Act shall be a citizen of Pakistan by birth.
- CONSTITUCIÓN POLÍTICA DE LA REPÚBLICA DE PANAMÁ DE 1972, REFORMADA POR LOS ACTOS REFORMATORIOS DE 1978, Y POR EL ACTO CONSTITUCIONAL DE 1983 - TITULO II: NACIONALIDAD Y EXTRANJERIA: ARTICULO 8. La nacionalidad panameña se adquiere por el nacimiento, por la naturalización o por disposición constitucional - ARTICULO 9: "Son Panameños por nacimientos: 1) Los nacidos en el territorio nacional | (translation) Panamanians by Birth: 1) Those born in the national territory"
- Manby, Bronwen (2010). "Citizenship Law in Africa: A Comparative Study." (PDF) (2nd ed.). Open Society Institute. Retrieved 2013-06-30.
- United Nations High Commissioner for Refugees. "Tanzania Citizenship Act, 1995". Refworld. Retrieved 2013-09-06.
5. Persons born in the United Republic on after Union Day (1)Subject to the provisions of subsection (2), every person born in the United Republic on or after Union Day shall be deemed to have become and to have continued to be a citizen of the United Republic with effect from the date of his birth, and with effect from the commencement of this Act shall become and continue to be a citizen of the United Republic, subject to the provisions of section 30.5
- Wikisource:Constitution of the Republic of Trinidad and Tobago/Chapter 2
- Constitution of Tuvalu Part III Section 45. Citizenship by birth: (1) Subject to subsections (3) and (4), a person born in Tuvalu on or after the date on which this Constitution took effect is a citizen of Tuvalu by birth." Note: section 3 pertains to children of foreign diplomats and section 4 pertains to children of belligerants at times of war
- "America's Founding Documents". 30 October 2015.
- United States v. Wong Kim Ark 169 U.S. 649 (1898); Ryan, John M. (27 August 2009). "Letters: U.S. citizenship". Silver City Sun-News. Retrieved 6 September 2009.
- Constitution of Venezuela (English translation) Chapter II, Nationality and Citizenship, Section One: Nationality, Article 32: Are Venezuelans* by birth: (1) Any person who was born within the territory of the Republic.
- Mancini, JoAnne; Finlay, Graham (September 2008). "'Citizenship Matters': Lessons from the Irish citizenship referendum". American Quarterly. American Quarterly. 60 (3): 575–599. doi:10.1353/aq.0.0034.
- NumbersUSA: "Nations Granting Birthright Citizenship" retrieved 22 October 2011
- "Part one of Bahraini citizenship" (PDF). Ref world. Retrieved 12 March 2015.
- title Law on Nationality of 20 August 1996 (unofficial translation)published by the United Nations High Commission for Refugees CHAPTER II KHMER NATIONALITY/CITIZENSHIP BY BIRTH ...shall obtain Khmer nationality/citizenship, by having been born in the Kingdom of Cambodia: a. any child who is born from a foreign mother and father (parents) who were born and living legally in the Kingdom of Cambodia.
- Constitution of the Republic of Chile, chap. II, art. 10, par. 1 (Spanish text; English version without recent changes) Article 10.- Chileans are: 1.- Persons born in the territory of Chile, with the exception of those children of foreigners who are in Chile serving their government, as well as those children of transient foreigners. However, all may opt for the Chilean nationality.
- Human Rights Brief: "The Constitution and the Right to Nationality in the Dominican Republic" 29 October 2010
- Soros.org: "A Crisis of Nationality: Dominicans of Haitian Descent" October 2013
- Ezequiel Abiu Lopez; Danica Coto (27 September 2013). "Dominican Republic To End Citizenship Of Those Whose Parents Entered Illegally". Huffington Post. Archived from the original on 14 November 2013.
- "A storm in Hispaniola". The Economist. 7 December 2013.
- Junta Central Electoral: Inventario de extranjeros en Registro Civil 1929–2007 por mandato de Sentencia TC/0168/13 November 2013
- "Respuesta al artículo del periódico New York Times: "Dominicans of Haitian Descent Cast Into Legal Limbo by Court"".
- e.g., child born in Greece to alien parents after coming of age (Nationality law of 1835, Article 2), child born in Greece of unknown father and mother (Greek Civil Law of 1856, Article 14, Paragraph c), child born in Greece and not automatically acquiring another nationality (Greek Nationality Code of 1955, Article 1, Paragraph d)
- (Greek) Article 1, Paragraph 2 of Greek Nationality Code (Law 3284 of 2004 (G.G. 217/Α/10 November 2004)
- "Article 1 A child of foreigner parents born in Greece acquires the right to Greek nationality under the following preconditions: a) He/she has enrolled in the first grade of elementary school and is still attending Greek school at the time the application-declaration of paragraph 2 is being lodged. b) One of their parents has been living legally and continuously for at least five (5) years in the country before the child was born. In case the child was born before this five year period had been completed, then the necessary period of legal and continuous residence of the parents is extended to ten (10) years. " See, Law 4332 of 2015
- "Athens Macedonian News Agency: News in English, 16-07-04".
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- "內地來港產子數目5年急增25倍 香港擬收緊綜援". People's Daily. 2008-03-10. Retrieved 2011-10-05.
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- New Zealand Visa Bureau: "1000 kids face deportation or being orphaned for breaching New Zealand visa rules" 7 October 2011
- "Portuguese Nationality Act" (PDF).
- خدمات الجنسية
- "Thailand". Republic of the Philippines: Office of the Solicitor General. Retrieved 2012-06-22.
- Yang, Bryant (2009). "Life and Death Away from the Golden Land: The Plight of Burmese Migrant Workers in Thailand". Thailand Law Journal. 12 (1). Retrieved 2012-06-22.
- "Amendments to the Nationality Act 2008". Government Gazette of Thailand. 125. 2008-02-27. Retrieved 2012-06-22.
- Sadiq, Kamal (2008). Paper Citizens: How Illegal Immigrants Acquire Citizenship in Developing Countries. Oxford University Press. p. 10. ISBN 978-0-19-537122-2.
- Bauböck, Rainer; Bernhard Perchinig; Wiebke Sievers (2007). Citizenship policies in the new Europe. Amsterdam University Press. p. 247. ISBN 978-90-5356-922-1.