Yes, Chester A. Arthur was, in fact, a U.S. citizen by birth. It was Arthur A. Chester who was Canadian. Thus the confusion.

Arthur A. Chester never ran for public office in either the U.S. or Canada. In fact, he was a lifelong drunk. His only accomplishment was to sire a daughter, Emily, who married the only fellow she could find whose worthlessness was equal to that of her father, a fellow named Malcolm McBride from the town of Blind River. Thanks to the procreative efforts of Emily and Malcom, Blind River is now overrun with worthless drunken reprobates named McBride.

Thus does Arthur A. Chester live on in spirit(s), if not in body.