Final answer:
The jus soli rule, or law of the soil, grants citizenship to anyone born on U.S. territory, as stated by the Fourteenth Amendment, regardless of parental nationality, with the exception of children born to foreign diplomats.
Step-by-step explanation:
The jus soli rule applies if a person is born in the United States. This rule, also known as the law of the soil or right of birthplace, is a fundamental concept of United States citizenship. According to the Fourteenth Amendment and the case of United States v. Wong Kim Ark, anyone born within the borders of the United States automatically gains U.S. citizenship, regardless of their parents' nationality. The only exceptions to this rule are children born to foreign diplomats residing in the U.S., as they are not considered under U.S. jurisdiction.
It is important to note that while jus sanguinis - or law of the blood - is also a principle of citizenship, where a child inherits the citizenship of their parents, it does not apply to those born within U.S. territory. Naturalization is the process by which a non-citizen may become a U.S. citizen, but this is separate from citizenship acquired at birth.