Since I was old enough to vote in presidential elections, I’ve heard plenty of grumbling across the political spectrum about moving to Canada if one candidate or another wins. And since I have been a full-time worker, I have also been party to a number of pie-in-the-sky conversations about the expat potential of retiring to Barcelona; Buenos Aires, Argentina; or Bangkok.

But conversations about leaving the United States have felt a little different over the last couple of years. It started when several of my parents’ contemporaries actually retired abroad, rather than just thinking about it. Then multiple friends picked up stakes—which included selling houses and........

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