Who was the 1st American-Canadian POTUS?
Chester A. Arthur assumed the presidency after Garfield was assassinated, or rather after his slow demise.
Arthur was plagued during his tenure by news hounds accusing him of being ineligible to the office, that his father was not a US citizen at the time of his birth.
Before his death, Arthur ordered all his personal papers burned.
Possibly Chester Arthur.
Not only thing you might not know, but that might not be....The TMZ equivalent high points of C.A.
http://mentalfloss.com/article/68824/8-things-you-might-not-know-about-chester-arthur