RE: It means owing exclusive political allegiance to the U.S.
That would disqualify even children born from those who come here as green card holders.
Those who legally apply for permanent residency do so with the INTENT of becoming American citizens.
Rubio’s parents, Jindal’s parents and Cruz’s father all went through this process.
You don’t come to the US and become a citizen overnight. You live here for at least 5 years before you qualify to apply for citizenship.
In the meantime they are technically “not in exclusive political allegiance” to the USA, no matter how much they desire to BE Americans.
So, a strict interpretation of “ exclusive political allegiance to the U.S.” would make Rubio a Cuban at birth and Jindal and Indian at birth.
That may be so, but couldn't it be interpreted also as the children's allegiance is determined by their parents' allegiance and thus citizenship passes to them when their parents become U. S. citizens?
Of course, then the issue of natural born citizen would likely come into play (I'm getting a headache..)