[El Gato]

What would the opposite of being born in the united states with two citizen parents -- thus a natural born citizen -- be?

Not being born in the U.S. and obtaining citizenship through a naturalization process.

Acctually the opposite of (born in the US) AND (Having two citizen parents) is:

(Not born in the US) OR (having 1 or no citizen parents). With the "OR" being inclusive (that is both be true).

Logic 101.

(NOT)(A and B) == (NOT A) or (NOT B).

[El Gato]

that is both be true

Oops

that is both *could* be true, for the overall statement to be true, IOW either A or B or both must be true for (A or B) to be true.