He might have also been born with a potential claim or an avenue to American citizenship that other Canadians weren't born with.
However, he or his parents had to claim that citizenship here for that claim to be recognized.
He was born Canadian, in fact and paperwork, and wasn't born with the citizenship paperwork that naturally comes with Natural Born American citizenship.
He had to be naturalized to obtain it, same as in the court cases similar to Ted's situation.
We've been there and done that before and it's called "Naturalized Citizenship".
Ted may have been born a citizen of Canada. One would have to check Canadian laws to verify. Ted was born as citizen of the US via Title 8 section 1401 - Nationals and Citizens of the US at birth. As such, he was born a US Citizen, has always been a US citizen, has never been naturalized, and has never needed to be naturalized.