American ensured birthright citizenship for all those born in the U.S. and the dangers of Trump's pledge to end the practice.

According to a 2020 study from Syracuse University, roughly 250,000 children are born in the U.S. to undocumented immigrant parents each year.

Trump says he wants to end birthright citizenship. But that goal is in tension with the Constitution, and an executive order could lead to an early Supreme Court test in his second term.

Courts have upheld the centuries-long history of birthright citizenship. If the Trump administration tries to end it, the question seems likely to reach the Supreme Court again.