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In page Anchor baby:

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In 2005, Ireland amended its constitution to become the last country in Europe to abolish unconditional jus soli citizenship, as a direct result of concerns over birth tourism. A headline case was Chen v Home Secretary, whereby a Chinese temporary migrant living in mainland United Kingdom travelled to Belfast, Northern Ireland to give birth to her daughter for the purpose of obtaining Irish citizenship for her daughter (Ireland's jus soli law extends to all parts of the island of Ireland, including Northern Ireland, which is part of the UK). The daughter's Irish citizenship was then used by her parents to obtain permanent residence in the UK as the parents of a dependent EU citizen.[1]