That single-parent requirement has been amended several times, but under the law in effect between 1952 and 1986 — Cruz was born in 1970 — someone must have a citizen parent who resided in the United States for at least 10 years, including five after the age of 14, in order to be considered a natural-born citizen. Cruz’s mother, Eleanor Darragh, was born in Delaware, lived most of her life in the United States, and gave birth to little Rafael Edward Cruz in her 30s. Q.E.D.
So why all the brouhaha about where Obama was born, given that there’s no dispute that his mother, Ann Dunham, was a citizen? Because his mother was 18 when she gave birth to the future president in 1961 and so couldn’t have met the 5-year-post-age-14 residency requirement. Had Obama been born a year later, it wouldn’t have mattered whether that birth took place in Hawaii, Kenya, Indonesia, or anywhere else. (For those born since 1986, by the way, the single citizen parent must have only resided here for five years, at least two of which must be after the age of 14.)
Does that then mean Viet Nam born children of an American soldier “citizen parent” who had “resided in the United States for at least 10 years, including five after the age of 14” are eligible? ...or also soldiers in Iraq, Germany, Turkey, etc. etc.? This could lead to a fascinating cast of future presidents. I guess allegiance could not be an issue then(?).