The 14th Amendment to the U.S. Constitution guarantees citizenship to anyone born on U.S. soil. That fact has led to a practice commonly known as "birth tourism," in which pregnant women from many countries come to the United States to give birth, so their children will be U.S. citizens. The issue has come up in this year's presidential campaign, and some are suggesting the U.S. needs to change the 14th Amendment. Yang Chen has more from Washington.
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