The US Supreme Court has agreed to hear a case challenging birthright citizenship, the constitutional right that guarantees citizenship to anyone born in the country. This right is based on the 14th Amendment, which has been in place for nearly 160 years. It states, "All persons born or naturalized in the United States, and subject to the jurisdiction thereof, are citizens of the United States." On his first day in office, January 2017, President Donald Trump signed an order to end birthright citizenship. However, lower courts blocked the order, citing questions on its constitutionality. The Supreme Court's final decision will either uphold citizenship rights for children of migrants who are in the US illegally or on temporary visas or end those rights. The justices will soon set a date for oral arguments between the government and plaintiffs, including immigrant parents and their children. Currently, the US is one of around 30 countries, mostly in the Americas, that grant automatic citizenship to anyone born within their borders.