Americans and dual citizens in Canada feel their loyalties shift north amid trade tensions

When U.S. citizen Kathy Lepold retired more than a decade ago, she and her Canadian husband decided to split their time between the two countries. Summers would be spent in Atlantic Canada, which they had fallen in love with on previous visits, and winters back home in West Chester, Penn., to be close to family and friends.It took one year of this arrangement for Ms. Lepold to realize her ideals were more Canadian than American: the environmental beauty, the politeness and a health care system that, while imperfect, would not deplete her retirement savings. The two sold their Pennsylvania home and relocated permanently to Wolfville, N.S. The former project manager got her permanent residency, then Canadian citizenship.