Mr. Walesa’s comments about Poland and Germany are a vivid illustration of just how much has changed in the minds of both nations, and of all Europeans. In 2011, Poland’s foreign minister, Radoslaw Sikorski, gave a speech expressing alarm not about an overly strong Germany, but about a Germany (Europe’s “indispensable nation,” he said) too timid and reluctant to take responsibility for the Continent. Who, in previous generations, could have imagined this?

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