Neither Canada, nor the USA, allowed dual citizenship when Ted was born. Ted's Canadian birth certificate says he was a Canadian citizen at birth.
Aside from this inconvenient fact, records show Ted's mother had naturalized as a Canadian citizen prior to his birth, thereby renouncing her US citizenship. She had no US citizenship to pass to Ted at the time of his birth.
Ted Cruz is a natural born citizen of Canada. He is not a natural born citizen of the USA, and may not even be a citizen of the US.
I know the Cruzlims think they are being cute by supporting a candidate that is clearly not eligible, just as the Democrats thought they were cute supporting the Kenyan usurper, and all of them know and knew that their candidate was not eligible for the office of president of the USA.
However, this sort of issue caused oceans of spilled blood in Europe for centuries. It can do the same here. Is this what these idiots really want?
They didn't recognize dual citizenship, but if one had grounds to claim citizenship in both countries then one had dual citizenship in fact, even if neither country would admit it.
Cruz's Canadian citizenship was governed by the 1947 Citizenship Act.
Here is the Act
http://historyofrights.ca/wp-content/uploads/statutes/CN_Citizenship.pdf
Section 10 governs naturalization. Under that section Cruz's parents would have been required to reside in Canada for four years before they could apply for Canadian citizenship.
Section 10 of the 1947 Citizenship Act of Canada:
(b) Have been lawfully admitted to Canada for permanent residence therein;
(c) he has resided continuously in Canada for a period of one year immediately preceding the date of the application and, in addition, except where the applicant has served outside of Canada in the armed forces of Canada during time of war or where the applicant is the wife of and resides in Canada to a Canadian citizen, has also resided in Canada for a further period of not less than four years during the previous six years immediately preceding the date of application.
Cruz would be a natural born Canadian citizen under Part 1 Section 5 (a) of the Act:
5. A person, born after the commencement of this Act, is a natural-born Canadian citizen: -
(a) if he is born in Canada or on a Canadian ship:
There is nothing in the Act about first having to give up any other citizenship.
There is a section of the Act that discusses a child with dual citizenship being allowed to renounce their Canadian citizenship if they so choose.
Part III
Section 17. (1) Where a natural-born Canadian citizen, at his birth or during his minority, or any Canadian citizen on marriage, became or becomes under the law of any other country a national or citizen of that country, if, after attaining the full age of twenty-one years, or after the marriage, he makes, while not under disability, and still a national or citizen, a declaration renouncing his Canadian citizenship, he shall thereupon cease to be a Canadian citizen.
If Canada did not recognize dual citizenship there would be no reason for them to have Section 17.
Cruz was a natural-born Canadian citizen who "at his birth" "became" "under the law" of the United States, a "citizen of" the United States.