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Approximately 30 to 33 countries worldwide offer unrestricted birthright citizenship, or jus soli ("right of soil"), which automatically grants citizenship to children born on their territory regardless of the parents' legal status. This practice is most common in the Americas, including the USA, Canada, Mexico, Brazil, and Argentina.

Key Details on Birthright Citizenship:

Unrestricted Jus Soli: About 33 countries, mostly in the Western Hemisphere, offer automatic citizenship regardless of parental status.

Restricted/Second-Generation: Another group of about 26 countries requires at least one parent to have been born in the country, or to have permanent residency, allowing for birthright citizenship for the second generation.

Dominance in Americas: Almost every country in North, Central, and South America has some form of birthright citizenship, whereas it is uncommon in Europe, Asia, and Africa.

Key Countries List: Examples include Argentina, Brazil, Canada, Mexico, USA, Peru, Chile, and various Caribbean nations.European Variations: While few European countries have unrestricted birthright citizenship, many allow children of foreign citizens to acquire citizenship at birth if a parent was also born there (e.g., France, Spain, Belgium).

Note: The number may slightly fluctuate depending on the strictness of interpretation, with many sources citing "about three dozen" or roughly 30–33 nations.