[Elyse]

As a US citizen Cruz’s mother was under the jurisdiction of the United States. It doesn’t matter what Canada’s law was, they can’t take US citizenship away from your child by automatically bestowing Canadian citizenship on them. US law is all that matters here and that law bestowed US citizenship on him at birth.

[4Zoltan]

I’m only making the points that

A) Cruz’s mom could not have been a Canadian citizen when he was born in 1970.

and

B) He could have been born with both Canadian and US citizenship.

[Theodore R.]

As a US citizen Cruz’s mother was under the jurisdiction of the United States. It doesn’t matter what Canada’s law was, they can’t take US citizenship away from your child by automatically bestowing Canadian citizenship on them. US law is all that matters here, and that law bestowed US citizenship on him at birth.

Best explanation of the matter I have seeen