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John Skrentny, a sociology professor at the University of California, San Diego, believes that, though birthright citizenship or jus soli is common throughout the Americas, "each nation-state had its own unique road to it".

Many African nations, which historically followed jus soli under colonial-era legal systems, later abandoned it after gaining independence.

Ireland was the last country in the region to allow unrestricted jus soli.

More than 30 countries - including Canada, Mexico, Malaysia and Lesotho - practise automatic "jus soli", or "right of the soil" without restriction.

Michelangelo Soli lawyer of Compagna, the director when Sylla was held, said her comments referred to several violent guests, and that despite shortcomings, Sylla and others weren’t mistreated.