Birth tourism is travel to another country for the purpose of giving birth in that country. "Anchor baby" is another related term which can have negative connotations. Reasons for the practice include free schooling, free medical, citizenship for child and parents and circumvention of China's one-child policy and in countries that recognize jus soli birthright citizenship for the child. The United States and Canada are popular destinations for birth tourism. Another target of birth tourism is Hong Kong, where mainland Chinese citizens travel to give birth to gain right of abode for their children.
To discourage birth tourism, Australia, France, Germany, Ireland, New Zealand, South Africa, and the United Kingdom have modified their citizenship laws at different times, granting citizenship by birth only if at least one parent is a citizen of the country or a legal permanent resident who has lived in the country for several years. Germany has never granted unconditional birthright citizenship, but has traditionally used jus sanguinis, so, by giving up the requirement of at least one citizen parent, Germany has softened rather than tightened its citizenship laws; however, unlike their children born and grown up in Germany, non-EU- and non-Swiss-citizen parents born and grown up abroad usually cannot have dual citizenship themselves. See also German nationality law.
No European country presently grants unconditional birthright citizenship; however, most countries in the Americas, e.g., the United States, Canada, Cuba, Mexico, Argentina, and Brazil do so. In Africa, Lesotho and Tanzania grant unconditional birthright citizenship, and so do in the Asian-Pacific region Fiji, Pakistan, and Tuvalu.
The United States, Canada, and Mexico all grant unconditional birthright citizenship and allow dual citizenship. The United States taxes its citizens and green card holders worldwide, even if they have never lived in the country. In Mexico, only naturalized citizens can lose their Mexican citizenship again (e.g., by naturalizing in another country). Military service is also mandatory there.
The Fourteenth Amendment to the United States Constitution guarantees U.S. citizenship to those born in the United States, provided the person is "subject to the jurisdiction" of the United States. Congress has further extended birthright citizenship to all inhabited U.S. territories except American Samoa. (People born in American Samoa get U.S. nationality without citizenship at birth.) Once they reach 21 years of age, as a birthright citizen, American-born children are able to sponsor their foreign families' U.S. citizenship and residency.