Concur. What matters is US law. Canadian law is irrelevant. (He was born in 1970? I used to hate it when the "old" baseball players were younger than me. Now it's the presidential candidates.)
So Cruz can choose to use his birth in Canada to be the PM there.
AND Cruz can choose to use his mother’s USA citizenship to be the USA president!
Way to go! Cruz can be USA president for the next 4 to 8 years, then go back to Canada to be the PM for Canada!
After that he will be the North American supreme leader!
Just like obola can be the Indonesian emperor after this, or be the Kenyan king and ultimately be the almighty one world king !