If your mom, a former US citizen, was in Canada around 1970, and had become a Canadian citizen (which required renouncing US citizenship), and registered to vote in Canada (which required Canadian citizenship), and you were born in December 1970 in Calgary, Alberta, you would be a Canadian citizen. Not a dual citizen; not a US citizen born abroad; a Canadian citizen, complete with a Canadian birth certificate, like the one Ted Cruz has stuffed away somewhere.
If you later came to the USA as a child, you could become a naturalized US citizen, and would therefore renounce your Canadian citizenship. If such naturalization did not take place, you would be an illegal alien.
In either case, you would never in this lifetime be constitutionally eligible to hold the office of President of the USA.
As an illegal alien, you would not be constitutionally eligible to hold office as a US Senator, as Ted Cruz is now doing.
However, with the dissolution of the USA, and the creation of a North American Union, as proposed by Heidi Cruz, that whole US Constitution thingee becomes a non-issue.
Well stated...a much more important issue!