In a world where people are more mobile than ever, nations are struggling to recalibrate who can be a citizen.

Here’s what to know about Trump’s proposal to add new restrictions in the U.S.—and how that compares to other countries.

“This could impact all U.S. citizens,” said Jacob Hamburger, a visiting professor at Cornell University who focuses on how immigration ... automatic citizenship for U.S.-born children of ...

But, no, we don’t know very well that the United States is the only country in the world that grants unconditional birthright ...

Brad Jones, a professor of political science at the University of California Davis, told Newsweek. Birthright citizenship has ...

Critics argue that it encourages illegal immigration and has created "birth tourism," where foreign nationals travel to the U.S. to give birth so that their child can obtain U.S. citizenship.

A federal judge has temporarily blocked Trump's order ending birthright citizenship, citing constitutional guarantees ...

A federal judge temporarily blocked President Trump’s executive order that aims to restrict automatic citizenship to babies ...

Writing last year in the Georgetown Immigration Law Journal ... Fourteenth Amendment of the Constitution excludes from citizenship the children, born in the United States, of citizens or subjects ...

Around three dozen countries and the U.S. offer automatic citizenship to children born within their borders, regardless of their parents immigration status.