On a September afternoon in Saint-Pierre and Miquelon — a fragment of France anchored off the coast of Newfoundland — Canadian Prime Minister Mark Carney met with French President Emmanuel Macron to mark a quiet but consequential turning point in the Atlantic world. The European Union, for the first time in its history, had extended an invitation of associate membership to a nation beyond its geographic and political orbit, choosing Canada as the proof that its institutional architecture could reach across oceans. It was a moment in which the old boundaries of a European project — built on sha