By that definition there's simply no such thing as dual US citizenship for someone from outside the USA. "No Person except a natural born Citizen, or a Citizen

By that definition there's simply no such thing as dual US citizenship for someone from outside the USA. "No Person except a natural born Citizen, or a Citizen of the United States, at the time of the Adoption of this Constitution, shall be eligible to the Office of President; neither shall any Person be eligible to that Office who shall not have attained to the Age of thirty five Years, and been fourteen Years a Resident ..."