Battered by a weak dollar and shocked by U.S. politics, Canadians are getting rid of their Florida homes at an inopportune time

Mark Hintz began flying the Canadian flag outside of his Florida home in January, after U.S. president-elect Donald Trump ratcheted up his talk about annexing Canada. The flag must have offended someone in Mr. Hintz’s gated community, because he received an unpleasant letter from his homeowners’ …