Ted Cruz was born in Canada. His mother was a U.S. citizen. His father, a Cuban, was not. Under U.S. law, the fact that Cruz was born to a U.S. citizen mother makes him a citizen from birth. In other words, he is a “natural born citizen” (as opposed to a naturalized citizen) and is constitutionally eligible.
Citizen at birth was Hamliton’s suggested language and was rejected as insufficient.
Natural born citizen was chosen as the strictest standard for excluding the admission of foreign influence on the office.
Only those who are naturally citizens because they could not be anything else are natural born citizens.
Anyone born with more than ONE nationality is NOT naturally an American.