Ted Cruz was born in Calgary, Alberta, Canada, December 22, 1970, to a US citizen mother and a Cuban citizen father.
Relevant law in December 1970 is Pub. L. 82-414 § 301(a)(7) (66 Stat. 163, 236)
What’s your point?
If Cruz runs are you going to sit out the election?
From your own link, Cruz was automatically a citizen at birth.
From your link, Sec 301, Chapter 1, para (7):
(7) a person born outside the geographical limits of the United States and its outlying possessions of parents one of whom is an alien, and the other a citizen of the United States who, prior to the birth of such person, was physically present in the United States ‘ or its outlying possessions for a period or periods totaling not less ‘ than ten years, at least five of which were after attaining the age “ of fourteen years: Provided^ That any periods of honorable service in the Armed Forces of the United States by such citizen parent may be included in computing the physical presence requirements “ of this paragraph.
Cruz’s mom was born in Delaware and graduated from Rice University in 1956. She was over nineteen years old. She had spent almost all of her life in the US. Cruz wasn’t born until 1970. So, by your link, Cruz was a citizen at birth.