Most of these countries are in the Americas, including Canada, Mexico and many nations in Central and South America. Dozens of other countries, from Germany to Australia, have a mixed approach, using a variety of principles, including parenthood, place of birth, residency and ethnicity, to decide a child’s citizenship.
The Supreme Court is expected to address the issue in the coming days, ruling on a Trump executive order that would upend more than a century of constitutional and legal history.
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