The question is, did any of those parents become citizens before their child was born?
Oh, so now we have a new question! What will be the new, new, new question if one or more of these President’s foreign-born parents never became a citizen?
As I understand all but Chester Arthur’s father. And that was hidden until Chester left office.
I think the argument can be made that having one parent, usually the father, as a citizen of another country imparts the child dual citizenship and the question arises as to allegiance.
People keep bring up that argument as if it held water.
Jefferson and Jackson were adult citizens, and Buchanan’s parents were US citizens, at the time of the adoption of the Constitution. All citizens at the time of the adoption of the Constitution were ‘grandfathered in’ relative to the “natural born’ requirement.
Arthur apparently lied about (or obfuscated, to be polite) his father’s citizenship status and it was not pursued at the time.
Wilson’s and Hoover’s mothers, not fathers, were foreign born. As understood at the time of the adoption of the Constitution, one’s citizenship was derived from the father, not the mother, thus as US citizens at the time of their childrens’ births, Messrs Wilson and Hoover passed along their citizenship to their sons, making them ‘natural born.”