The birth of Prince Harry and Meghan's baby boy has signalled the first time that a person has had the right to become both the British monarch and the US President. Baby Sussex is automatically a British citizen based on the Duke of Sussex's citizenship status and also due to being born in the UK. But assuming Meghan did not voluntarily give up her own US citizenship when she married Harry, which she was no required to do by law, the baby will also be granted American citizenship himself. The implication of being naturally-born citizen of the United States means...