A map of the world indicating countries with jus soli (birthright) citizenship. The United States and almost all American countries have jus soli citizenship; few countries outside do.

Countries in dark blue grant jus soli without restrictions; all other countries require at least one parent to have citizenship or residency.

Jus soli is the predominant rule in the Americas…

Almost all states in Europe, Asia, Africa and Oceania grant nationality at birth based upon the principle of jus sanguinis (“right of blood”), in which nationality is inherited through parents rather than birthplace, or a restricted version of jus soli in which nationality by birthplace is automatic only for the children of certain immigrants.

The alternative, jus sanguinis (by blood) citizenship, is in my opinion an abomination.

From the Wikipedia article “Jus soli.”