The Legal Foundation of Birthright Citizenship

The U.S. concept of birthright citizenship is rooted in the legal principle of jus soli, or “right of soil.” This guarantee, which provides citizenship to nearly everyone born on American territory, has been a cornerstone of U.S. law for over a century.

Following the Civil War, this right was enshrined in the 14th Amendment to the Constitution to ensure that former slaves were recognized as citizens. The amendment states: “All persons born or naturalized in the United States and subject to the jurisdiction thereof, are citizens of the United States.”

The Supreme Court Precedent

The interpretation of this amendment was solidified by the case of Wong Kim Ark. After being denied reentry into the U.S. despite being born there to Chinese parents, the Supreme Court ruled that the 14th Amendment grants citizenship to all born on U.S. soil, regardless of the legal status of their parents. Currently, the only exceptions to this rule apply to specific groups, such as children born to foreign diplomats.

Global Citizenship Models: Jus Soli vs. Jus Sanguinis

While birthright citizenship is a staple of U.S. law, it is relatively uncommon globally. Only about three dozen countries, primarily located in the Americas, offer automatic citizenship based on territory.

Most nations follow the principle of jus sanguinis, or “right of blood,” where a child’s citizenship is determined by the status of their parents rather than their place of birth. For instance, none of the 27 European Union member states provide automatic, unconditional citizenship to children born to foreign citizens on their soil. Similar policies are standard across much of Asia, Africa, and the Middle East.

Shifting Policies and Interpretations

Some countries utilize a hybrid approach, incorporating factors like residency, ethnicity, and parenthood. Australia, for example, ended unconditional birthright citizenship in 1986, requiring at least one parent to be a citizen or permanent resident.

Conversely, Germany recently liberalized its laws. As of 2024, children born to non-German parents can receive citizenship if one parent has held unlimited residency for at least five years. The German government noted that early citizenship improves educational prospects for children with migration backgrounds.

The Current Legal Challenge

The upcoming Supreme Court case stems from an executive order signed by President Trump on his first day in office, which seeks to end birthright citizenship. Proponents of this restriction focus on the phrase “subject to the jurisdiction thereof” within the 14th Amendment. They argue this language allows the U.S. to deny citizenship to children born to women residing in the country illegally.