Btw, all your gratuitous insults notwithstanding, I have actually read Canada’s Birthright Citizenship Act. There is nothing—zero, squat, the donut—about any person having to take any kind of action whatsoever when they ‘reach their majority.’ Nothing. That is a total and complete Cruz family myth/fabrication. Cruz became a NBC of Canada by virtue of being born there, period.
Then, you should read American citizenship law.
My response was totally predicated on American citizenship law -- which is the relevant issue. Canada may well have listed Cruz as a citizen -- but Cruz was an American citizen and American citizenship law doesn't recognize other citizenship laws.