SIOUX FALLS, S.D. (AP) — Potentially millions of Americans suddenly have a much easier path to Canadian citizenship, prompting a rush of people to explore their ancestry and file paperwork seeking dual citizenship . For people like Zack Loud of Farmington, Minnesota, it was a surprise to learn that under a new law, Canada already considered him and his siblings citizens because their grandmother is Canadian. “My wife and I were already talking about potentially looking at jobs outside the