Birthright citizenship is citizenship acquired automatically at birth without requiring subsequent formal application, naturalization, or affirmative claim. It's granted on the basis of either jus soli (birth in a country's territory) or jus sanguinis (descent from a citizen parent), depending on the country's legal framework. Birthright citizenship is the dominant mechanism of citizenship acquisition worldwide and a defining feature of modern nationality law.
In the United States, birthright citizenship is constitutionally mandated through the 14th Amendment, ratified in 1868. The amendment provides: "All persons born or naturalized in the United States, and subject to the jurisdiction thereof, are citizens of the United States." This established birthright citizenship for all people born in US territory, subject only to a narrow exception for those not "subject to the jurisdiction" of the United States. Historically this meant excluding diplomats (who maintain foreign diplomatic immunity) and Native Americans subject to tribal jurisdiction. The Native American exception has been largely superseded by subsequent statutory law.
The 14th Amendment was adopted to provide birthright citizenship to formerly enslaved people and their descendants, ensuring that emancipation granted not merely freedom but full US citizenship. The Supreme Court definitively established the scope of birthright citizenship in United States v. Wong Kim Ark (1898), holding that a child born in the United States to immigrant parents automatically acquired US citizenship through birth in US territory. This ruling established that parental immigration status doesn't affect birthright citizenship.
Birthright citizenship exists in approximately 30 countries worldwide, though mechanisms vary. In the United States, Canada, Brazil, and most Latin American countries, it operates through jus soli. All people born in the country's territory automatically acquire citizenship. In European, Asian, and other countries, it operates through jus sanguinis. Children born to citizen parents automatically acquire citizenship regardless of birthplace.
The distinction between jus soli and jus sanguinis birthright citizenship creates different outcomes. In jus soli systems, birthright citizenship is territorial—birthplace determines citizenship regardless of parents. In jus sanguinis systems, it's familial—parentage determines citizenship regardless of birthplace. Most countries apply jus sanguinis birthright citizenship. Only approximately 30 countries apply jus soli birthright citizenship, primarily in the Americas.
Birthright citizenship is distinct from naturalized citizenship. Naturalized citizenship comes through a formal application process, typically involving residency requirements, language testing, civics examinations, and oaths of allegiance. Birthright citizens acquire citizenship automatically at birth without any formal process. In many countries, both types are legally equivalent once acquired, though some constitutions maintain distinctions. The US Constitution restricts the office of President to natural-born citizens, for example.
The legal distinction between birthright and naturalized citizenship reflects different acquisition processes, but modern law typically treats both as full citizenship conferring identical rights and responsibilities. However, some countries maintain restrictions applicable only to naturalized citizens—restrictions on holding certain high government offices or some professions.
Birth tourism—traveling to a jus soli country specifically to give birth and secure citizenship—has become increasingly common and controversial, particularly in the United States. Wealthy people from countries with restrictive or low-utility passports travel to the US, give birth, and return home with US-citizen infants, acquiring US citizenship for their children despite parental non-residency.
This phenomenon has sparked political debates about whether birthright citizenship should be restricted. Critics argue that birthright citizenship incentivizes unlawful immigration and that citizenship should be restricted to children of authorized residents or citizens. Supporters argue that birthright citizenship serves integration functions by ensuring children born in a country become citizens, preventing permanent non-citizen underclasses.
The political debate has intensified in recent years in the United States, with proposals to amend the Constitution or restrict birthright citizenship through legislation. However, any such change would face substantial legal and political obstacles. Constitutional amendment would require supermajority support in both houses of Congress and ratification by 38 states. Statutory restriction would likely face constitutional challenges based on the 14th Amendment's plain language.
Several countries historically practiced jus soli birthright citizenship but have shifted toward more restrictive policies. Ireland once granted birthright citizenship to all people born in Irish territory, but in 1992 restricted it in response to rising immigration. The United Kingdom restricted it in the 1980s. These shifts reflect a global trend toward more restrictive citizenship policies driven by immigration control concerns.
Conversely, several countries have expanded birthright citizenship or liberalized pathways to it. Germany expanded conditional jus soli citizenship for children born to long-term resident parents in recent decades. Some countries have modified their systems to prevent statelessness by granting birthright citizenship in circumstances where it would otherwise not apply.
In jus soli systems, birthright citizenship isn't contingent on parental immigration status. A child born in the United States to undocumented immigrant parents automatically acquires US citizenship through jus soli, even though the parents lack immigration authorization. This creates situations where children are US citizens but their parents are undocumented immigrants. The child is authorized to reside indefinitely while the parents face deportation.
This creates complex family situations and has been a source of both policy and political controversy. Some argue that birthright citizenship to children of undocumented immigrants incentivizes unlawful immigration and should be restricted. Others argue that restricting birthright citizenship would create stateless children or permanent non-citizen underclasses.
A significant advantage of birthright citizenship—whether through jus soli or jus sanguinis—is that it reduces the risk of statelessness, having no citizenship anywhere. International human rights law encourages countries to adopt citizenship principles (including birthright citizenship provisions) that prevent statelessness. Many stateless populations exist partly because they weren't granted birthright citizenship and have been unable to acquire citizenship through other means.
The Convention on the Rights of the Child obligates signatory states to ensure every child has the right to a nationality, implicitly encouraging birthright citizenship. The International Covenant on Civil and Political Rights similarly encourages states to adopt citizenship law preventing statelessness.
Birthright citizenship is considered a human right under international law. The Universal Declaration of Human Rights (Article 15) recognizes that everyone has the right to a nationality. Birthright citizenship ensures that newborns automatically acquire a nationality, preventing statelessness and protecting fundamental human rights. Countries that restrict birthright citizenship risk creating stateless populations with reduced rights.
A widespread misconception is that birthright citizenship is universal and automatic everywhere. In reality, approximately 30 countries practice jus soli birthright citizenship, while remaining countries apply jus sanguinis birthright citizenship. The two systems produce different results. Some countries require descent from citizen parents for birthright citizenship, while others grant it based on birthplace alone.
Another misconception is that birthright citizenship cannot be lost. In reality, some countries permit or require citizens to renounce citizenship, and some countries terminate citizenship in specific circumstances (such as voluntary acquisition of another nationality). Birthright citizenship as initially acquired typically cannot be revoked without the citizen's consent, but circumstances exist where citizenship can be lost.
Many also misunderstand the distinction between birthright citizenship and immigration status. Birthright citizenship determines whether someone is a citizen. Immigration status determines whether someone is authorized to reside in a country. A child acquiring birthright citizenship becomes a citizen but doesn't automatically gain immigration or residence rights outside the country of citizenship.