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 Baby Sussex could one day run for office as US President.
In order for a child who was born abroad to a US citizen parent who is married to a non-US citizen, the citizen, who would be Meghan in this case, must have lived in the United States for at least five years, and two of those years must have been after the age of 14.
The birth of Baby Sussex must then be officially reported to an American consulate in order for him to obtain US citizenship.
US law does not officially recognize dual citizenship, but it doesn't prohibit it either.
Baby Sussex's British citizenship would not be affected if the Duke and Duchess of Sussex choose to obtain US citizenship for their child.
However, US tax implications could prevent the couple from seeking American citizenship for their new bundle of joy.
All US citizens are required by law to report income from all sources within and outside of the US, meaning Baby Sussex could face a tax bill in the States.